M-audio av40 or fostex pm-0.3 as active monitors. But at this price point, why not get one of those mini component sets by philips or sony? They should deliver quite a kick. Or get some used passive hifi speakers and pair them with a cheap but impressive-sounding t-class amp 
The speakers I linked earlier are within your pricerange; I have the smaller+older version which sound great at medium-high volumes. My friend actually asked if I had a sub when he was mixing using my T20s.
I’m guessing that since you don’t want to find room for a big amp, you also don’t want find room for a big sub either.
Hifi speakers are designed to sound “nice” and should be less fatiguing than monitors.
No bass tho… At least, not at the levels the av40 can deliver
These are what I’m using right now - 2 speakers and a sub:
Creative Inspire 5.1 5300
I want something that sounds better than these…
You’re not going to get much improvement for £100
Really? I would assume that any of the ones I linked to would sound better than the 5.1’s I’m using now.
I’ve had them for bloody years! I think I got them on ebay with a 5.1 soundcard for a desktop PC for about £15! That soundcard served me bloody well, too. 3 stereo outputs that I used for DJ’ing in Ableton. (2 “decks” and a monitor. God I had fun with that set-up!)
The AV40s look good if you can fit them in, otherwise the T40s are a good option for a smaller desk.
You could probably keep using your Inspire 5300 sub too for a little extra bass?
Why are you producing with headphones?
Please, whatever you do, do not take Makar’s advice and buy more computer speakers.
Like I said, if you go second hand, you can get a REALLY nice audiophile setup for peanuts.
A few years back, I had an Arcam Alpha 7 which I picked up for £50; originally, they retailed for over £400. Later I had a Denon PMA255, then an AVR1905, and now I’ve got a Teac A-H300 (a good option if space is at a premium). I paid no more than £100 for any of them; the closest was the Teac at £80.
Speaker-wise, there are some INCREDIBLE deals out there on Gumtree and carboots. Look for anything by Mordaunt Short, Celestion (although not the MP-1s as they have no bass whatsoever, they’re basically surround spots / monitors), Mission, KEF, Wharfedale or - if you get INCREDIBLY lucky at a car boot - Monitor Audio. The most you’ll pay for a set of bookshelves is a tenner, maybe £30 for some floorstanders, simply because people have NO CLUE as to their true value. Typically they’re inherited from relatives, or they bought them years ago and stopped using them “because they’ve got a sweet iPod dock now”.
As you’re in the UK, you’re most likely to come across Mordaunt Short and Wharfedale, both of which are fantastic and will give you FAR better sound than any of the active monitors out there in the same price range.
Here’s some results from a quick tappity-tap, local to you:
Used stuff for sale | Gumtree — holy crap, that’s an INSANE deal. Those retailed for about £250 a pair. Tweeter issue is probably a crossover cap failure; if not, Monitor Audio still sells parts for them.
Used stuff for sale | Gumtree – said he’ll split the package, offer him £50 for the speakers
Pardon our interruption... – these are the ones I’m planning on getting at some point
Amplifier-wise, there’s a REALLY nice Rotel on eBay at the moment near you:
Some alternatives:
I don’t see any powered speakers there.
That’s the point. I don’t advocate the use of active speakers, whatsoever. The only exception I’d make to this is PA stuff (specifically for gigging), and powered subs for home cinema use, because of the reduced need for a high quality amplifier and the prohibitive cost of decent separate monoblocks.
For audio, decent quality hifi speakers and a stereo amplifier are the best option; and usually the cheapest, if you’re smart about it.
I completely agree on using passive speakers, which is why I recommended them as my 1st reply to the thread. But then he said he didn’t want to have a separate amp which of course is very limiting at this pricerange.
I have a pair of Alesis Monitor One mk2. They are sound pretty good and have good bass. They are placed at head height at each end of my desk. Got mine for around £120
I , on the other hand, hate passive speakers if they’re not biamplifiable.
Sure, higher priced boxes will aoid very good, but buying a pair of floorstanders for 10$ usually gets you a pair of great-looking, sgit-sounding white van speakers, or some used-to-be-great boxes with rotten surrounds and corroded interconnects.
Very true. But my advice to anyone thinking that would just be to get used to the idea of using an amp 
Like other people have said, active monitors are useful for production, but not particularly good for listening.
You’d be surprised… all of my Mordaunts are biampable, although personally I don’t see the point for listening to 320kbps MP3s. If I was using SACD or DVDA sources, then maybe.
Patch, this is what I’m using at the moment. Took me a while to settle on the perfect combination, but this configuration, plus a set of MS5.30s under the desk powered by a separate amp when I want a LOT of bass do the job perfectly. Whenever anyone comes over I sit them down and play David Guetta - Titanium and they literally sit there with an open mouth haha.
^What I’m using at the moment, the Wharfedale Diamond 9.1s (linked on 1st page). I’ve got a SW150 sub under the table too, but that stays off most of the time as the 9.1s have plenty of bass for normal listening.
Both of those amps look like they’d squeeze into cube in my expedit…
What are they, and how much can they be had for? 
That’s a Class T amp, they’re like £50 from eBay brand new. Relatively low power, but ultra-low distortion levels. And they’re TINY. Only downside is, there’s no tone controls on the amp, so you’ll have to do your EQing in software which is a bit of a pain.
The Teac is a gorgeous “little” thing although it’s bulkier than it looks. It’s about the size of a shoebox, and fairly heavy due to the massive toroidal transformer inside. Fantastic sound quality though; unlike the Class Ts it actually has a “character”, although that does mean you need to match the speakers you choose to it carefully.
EDIT: Also, the Diamond 9.1s are very nice, although pricey brand new.
EDIT2: Teacs in WORKING ORDER usually go for between £50-100:
Although there is one available at the moment Buy It Now for £79.99: Pardon our interruption...