Well, I went to BestBuy and got that Sapphire card for 160 dollars.
I don't know if it was a sale or what, but it sure made me toss my old Radeon in the spare parts bin.
You have a 1GB hard drive? That isn't any good. Unless you meant 1TB of course.
If you want a gaming computer, make sure your power has SATA connections to it because personally SATA > IDE in a long shot.
NewEgg often has specials if you can spare a day or two on a lot of items.
For instance, day 1 might have a CPU/mb combo for 150 and then tomorrow it'll drop to 120 + a discount on "gaming" RAM.
Personally for RAM, I use the high performance kind, since I overclock a lot.
Hope I can help you in the future.