I need a faster hard drive?

I have a 7200 rpm hard drive its 1 tera and the windows index says its a 5.9 score everything else is a 7.6 or 7.8 score i have an amd x6 black series prossesor oced to 4.02 with easy tunes and my mobo is a ud3h gygabyte board is has all types of hard drive hook ups. i only have a single 4 gig stick of ram but usually dont use it all i know i need 3 more sticks. and i have a 900/1000peek psu and a amd radeon 6870 video card only one not xfire. every once in a while my pc will freeze while starting up but thats due to the ocing and i like my games running with good fsp at max graphics. i also have all 6 cores unlocked and windows starts with all 6 running that may also cause the freezing . i have windows 7 64 bit ultimate. but my hard drive is still slow and i feel its causing my pc to bottleneck. My question is im wanting at least a 1 terabyte hard drive but the only thing i see thats even faster than 7200 is the 10000 and there only like 80 gig and $300 and on up. im hoping to find some help on a good hard drive thats fast but also affordable if needed i can get an 80 and make it my primary and use the terabyte for a sec.thanks a bunch for any help on my problem