This`ll check ESET I guess. - yay!
Ok u`ve ordered a PCI-E gfx card and the 210s have AGP slots, so there was the first mystery
In the whole picture of upgrading the Dell, u have 1.5g and a P4 640. In terms of pc power for an outstanding new game, I think u`r hitting the minimum I`d personally enjoy playing it with. If I remember correctly the Dell has 4 slots for memory, so u`ve even got some kind of odd pairing going on - but meh, 1.5g is probably enough knowing these coders, u`r just going to be hampered by the access speed.
In all honestly, u were in the right-ish ball-park with the card. It`s around the amount u`d want to spend to upgrade the Dell b4 thinking of a complete overhaul of mobo/cpu/mem etc.
7600GS - but an AGP version, should have been fine.
Cost wize, u may consider going with perhaps a 7600GT, 7800 or even 7900 - just be sure the card description says it`s an AGP, and when installing it remember that it`s highly likely to want a molex connector plugged in the back of it.