So I'm thinking about buying a 360 and later Halo Reach. I was looking at the slims being that they actually have internal wifi (like they should have had from the get go). I guess my question is, will I have any issues getting the 4GB version? Is that plenty of space to play games on live? I'm trying not to spend too much money. Where could I find the best deal on a 360 that actually includes a suitable warranty?