As you directed a reply at me it would be rude not to respond.
Regarding UT3, I think the last UT game I played was actually the first (although that may well have been 7 months ago as it works well on our machines/network) so I am out on that front although a quick search says it is fairly lightweight compared to what is out now.
Your budget is fairly tight to do all you want.
Re ram. 32 bit operating systems only get along well (stuff like PAE:
http://www.microsoft.com/whdc/system/platf...PAE/PAEdrv.mspx exists but let us not get into that).
On top of this your graphics card and various other devices sit so your 4 gigs is less the graphics cards (which sits around 768 or more these days for a good one).
While ram may be cheap the money you will kill on it can just as easily go for the next model up on the graphics card, a new drive (you will not really use the ram but you will use the space).
You will probably get more speed from installing a second drive and using that for speed purposes rather than the token speed from the ram.
Again I have 2 gigs (no virtual memory/page file at all), I run a fairly lean version of XP but use it for high end games, video encoding and CAD and aside from memory leaks I barely touch the limit.
PSU: I am not the greatest fan of Tom's Hardware but it seems they did a decent test on the subject of graphics and PSU:
http://www.tomshardware.co.uk/geforce-rade...view-31495.html
The usual advice of do not just buy a cheap one stands though.
Graphics: I am stuck in the past somewhat (my 7900gs plays all the latest games well enough for me) although I am still struggling to consider the 8XXX a worthy successor and with the 9XXX series being little more than a rebadged 8XXX series.