Video Games

320GB seems a bit excessive unless you're going to be downloading a lot of films/games and storing your music collection on it. I have 160gb it's easily enough for me. I'd have a think about what you're likely to be storing on it, and see how much the extra space costs.

All ps3's support 3d bluerays since version 3.50 of the system software. So you don't need to pay any extra for a '3D Blueray player'.

I use play tv to record tv. 1hour = 1gb = Bigger is better
I bought a 500gb sata 2 harddrive 2 years ago for about £50. I have used about 340gb so far. Lots of games now have huge install requirements.