I wouldn't bother sinking more money on memory in that PC - he says it's limited to 1gig (perhaps only 2 slots?) and since he won't be playing on max settings he can probably get away with 1gig RAM.
7600GT would definitely be the upgrade I'd recommend - will give high fps in most titles up to around 1152x864.
7600GT would definitely be the upgrade I'd recommend - will give high fps in most titles up to around 1152x864.