I’d go with a pair of technics & traktor scratch pro. nothing feels realer than that. Can be done fairly inexpensive as well.
my first controller was a keyboard 
i second that! and i can tell you, that i still have that one!
This kid has got RGAS BAAAAD. Sounds like he can afford it, though…
So, I suppose it’s just GA, then.
I’ve said it before a million times, by far the BEST way to start out is simply with a keyboard and mouse. Learn your software inside out, find out what it actually IS that you want your controller to control, then get the controller that matches your requirements closely enough.
You’ll be lucky if you find a single controller that fits your need exactly.
I started on keyboard and mouse. Now 6 years later im on an S2
Also if you want to get more technical turn it to midi mode and make some custom mappings.
Keyboard, and a number pad was my start. Then a bcd3000
Op, seeing as you mastered the S2 so quick, pick up an S4, 2 F1s, 2 X1s, a pair of CDJ2000s, a pair of Technics 1200 mk8s, a midifighter pro, and a MF3D, some beats studio cans, a B&D 4 speed mixer, 4 KRK rokits and a 16" subwoofer. That should set you up just nice, and you will have some new stuff to master.
Get two belt driven turntables and the shittiest mixer you can find, then buy some old records. If you learn to mix on them then you can use pretty much anything
I kind of agree, crap DJ hardware and that really makes you ready for anything. Also forces you to work more about song selections, transitions and stuff that is really important.
I started out on my laptop keyboard running VDJ…then I got a Hercules RMX which was actually amazing and fit my needs perfectly once i mapped it out. i started beatmatching on that and then got invited to play a show…where the house equipment was 2000’s…armed with 2thumb drives and a shit load of adrenaline i learned quick and almost shit my pants cause i was so nervous…nothing like just getting thrown in the pool and told to swim…now i have two gemini cdj 600s a gemini mixer and if i wanna run on my laptop i run the 600s through my rmx. learn what kinda djing you want to do…if you just wanna play parties and maybe a bar every now and then stick w/ the s2 and try different mapping and maybe add an f1 to get creative…if you wanna club dj or even show dj then grab a pair of cheap cdjs and mixer and learn to go without the computer like i had to…cause most of the time the club or shows will have house equipment such as pio 1000s or 2000s…
This actually is not a bad idea, I started with Soundlab DLP’1s (belt drive) and a 2 ch mixer (with 3 band EQ on the output only, no individual ch EQ), if you can nail down 1-2min transitions with no trainwreck, moving over to Technics was like a dream move. It also taught me to carefully adjust the volume fader, manage the transition, ride the pitch, know your records inside out etc. Good basic skills still used now.
Great thread. I myself been into this scene like house and techno music for a long long time exploring lots of different styles from IDM,dub techno, proper dubstep, deep house etc and pretty much starting out to get a traktor s4 to get into it and get good at it and not try to use the sync button as well and then probably upgrade to the cdjs + mixer route when I start to get something serious. Seriously the traktor s2/s4 is an awesome way to start out I think since cdj+mixer or TT+mixer route can get real expensive for a start.
Oh Lord. (massive facepalm)
I started out on crappy belt drive turntables 28 years ago… we had to… dj equipment was basic. We used skill to improvise.
The music inspired us to find ways to be Totally creative.
And you dis one of the easiest digital controllers in history to use … everything is mapped!
If it don’t feel authentic… use Vinyl!!! 
I don’t understand this thread.
Using a control s2 for all my gigs I have used cdj 2000 and had to all most exclusively in the clubs I can tell you that the s2 can hold its own once you know your gear and its limits you will be good. Also don’t worry about other DJ’s for some reason that is the only people who are clamouring about you gear anyway.