Hmmm big speakers?! I would be careful to chose my monitors to be honest. Big does not mean good, remember that kids. I have VERY small Monitors (Genelec 1029A) and they suite me REALLY good for the room I have, and the sound they produce all over for the music I am making is marvelous. If you want to chose Monitors then you really want to make sure you get them from someone who knows about them, rather than someone that tries to sell you the biggest most expensive ones…
As a good tip I can only say that the Genelec’s have done me good for House/Trance/Techno so far. They are a bit crappy on the bass side, but that has only trained my ear throughout the years with these speakers. I have had them 5 years now, and I have had NO PROBLEMS with them ever. It might be hard to get hold of those though, since they are no longer manufactured.
Sure a good DAW, etc etc is good, but Monitors are essential if you seriously want to produce stuff.
I have heard really good stuff from people producing electronic music about some Mackie Monitors as well. And some of my friends are really happy with KRK.
About the Ableton vs Logic thingy. I love them both, but Logic just has more to it than Ableton does. But Logic can NEVER beat Ableton at creating a dynamic LIVE set. With logic however, you can do more COMPLICATED things easier. Sure you can probably achieve the same things in Ableton, but its often with a lot of tweaking (IN MY EXPERIENCE!). However, since I have no clue how Ableton 8 will tackle some things, you might wanna wait. I have both, cause I like to have the best of everything 
You could go Cubase as well, it is VERY good! On my PC I still use Cubase, and I am really happy with it. It is similar to Logic in the structure, but a bit easier to understand. Results are the same though.
Anyways, when building your studio, take your time and make sure you have as much information as possible! There is a lot of information on the interwebz, but sometimes its better to get into that music store and just ask a few questions, listen to the gear, try the keyboards and ask for a free session in Logic or Cubase… It sure helps! 
Just my few cents 