Its a great drive. i think for the amount your spending on the caviar you can get a 1tb spinpoint, and its just as good.
Forgot to mention though that you might wanna wait a little. in several weeks the new line of cpu's from intel are coming out. You might want one of those instead. Up to you though. The only thing the i7 or x6 will do better is video encoding faster, and i see you didnt list that you'd be doing any of that so the i5 will do just as good as the other 2 in gaming.