I can now buy a 660!
I didn't realise that I had more money
If I were you I would get a different HDD. WD Caviar Black/Blue, an F3 Spinpoint (my favorites) and the Seagate Barracuda is noteworthy. The Caviar Greens are low power storage drives. If you want better performance, you should switch to one of the drives I mentioned at your size.
WD has different tiers for the HDD's. Green is a environmentally friendly storage drive. It's designed to hold lots of stuff, but not be particularly fast. The Blue tier is a midrange, decent price/storage/performance. Black is their performance drives, high storage, great performance, but are a tad pricier. Like I said, if you want performance, avoid the Green drives. There good drives for sure, but there is much better options, especially if you want a gaymin PC. You want to look at WD Blacks/Blues, F3's, or Barracudas.