I would recommend you go for the 250 GB version, it is pretty pricey but it can withstand a lot of downloads and games. I've had it for about a year and a half and I have encountered no problems with it.
Also about all of the disagreements regarding the ps3 and xbox controllers; it is just a matter of opinion and what your suited to and prefer. I have used the ps3 controllers more than the xbox ones so I am suited to that but if you play both consoles regularly, you'll find differences between them. What I don't understand is the flamming against the ps3's and sony in general, but I'm not getting into it.