I am purchasing a new HD for my son's gaming computer and I wanted to know what would be best. Should I purchase 2 320GB or 400GB or just 1 1TB or 750GB. He has a 250GB 7200RPM in it now he will use for data. Also, I noticed on the larger HD the Cache is 32MB and on the smaller ones a max of 16MB which way should I go there. I am looking at Seagate Barracuda and one Samsung spinpoint. I'm sure he would love the Solid State Drives or the raptor but the price is to high. Any suggestions would be great for this newbie