Beggsy, what are you looking to do with the pc? If you walk into a pc shop, thats the 1st thing theyll ask you.
And I agree with flight, certainly get greater than 512MB of ram, i got 2GB. Also, get DDR2 ram as its faster.
I just got a new comp:
Intel Core 2 Duo 2.4 ghz
2GB DDR2-RAM
Nvidia 7900GTX 512MB
For that, i ordered the parts separately, and got a local pc shop to build it for me