Reply to DJ Gear Decision for a Beginner

Hey Guys! My name is Kevin and I am a DJ enthusiast, or at least I have been. Until now, I have mainly been messing around with just programs, mainly Virtual DJ and my dream is to own a NS7FX, but it doesn't seem like its gonna happen anytime soon. Thing is, I have come across a bit of cash (around 800/900 Max) and I was recently wondering on buying a set or controller. All my music is digital and mainly mp3, I don't even have any CD's really. So i felt like getting a controller would be sensible. What I want from my set up is basically the ability to scratch well and also to play my digital files seamlessly. Other than that, just a dependable piece of hardware, because this might last me a long while. I am interested in Turntableism, but I am also open to every type of music.

I came across the Numark Mixdeck and it seemed very versatile and also afforable too. I contacted someone on craigslist and he offered me 525 for it. I was Ready to buy this, but then i heard people's opinion on it here and on some general reviews... so now im not so sure.

Then I looked into the Traktor Kontrol S4. Though I know it is pretty new, i have heard good things about it, although ive also heard it is a bit buggy? In my opinion it seems a tad bit compact and small for me. Is it comfortable to use? I might slightly prefer bigger platters, but ive never owned a set so im not sure.

And finally ive heard about the VCI-300's. Supposedly this is one of the most stable controllers on the market? or so ive read. But i've also read that this set up is very basic?

And I am not even sure what the diffrence is between the VCI-100 and VCI-300... I know that sounds very foolish of me, but to my understanding, the VCI-100 only has the ability to control MIDIs?

Sorry for such a lengthy post, but I've been doing research for about a week and this is what I've gotten up to; 4 choices and a bit of confusion. Would you guys mind helping me out? Which in your opinion is best overall? and which is best for my purposes? Thanks! Appreciate your Help!