Looking to upgrade?

[Lord Darkblade]

I recently purchased a computer (or rather my parents got me one for Christmas/Birthday), it plays older games well (Unreal 2 = silky ), however putting in things like fear seems to tax the machine even on 640x480 . What I would like is a graphics card to get me reasonably upto date (£200 limit probably), not looking for top end graphics from stuff like FEAR however something that will do well in stuff like CS:S and UT2K4 would be nice.

Currently its a Compaq 1639:

AMD Athlon™ 64 processor 3700+
1GB DDR SD-RAM
2 SATA 160GB drives (7200 I think)
NVIDIA® GeForce™ 6200SE Turbocache 256MB
(PCI-E x16 slot)
3 PCI Slots (1 free)

Its nothing spectacular but its a start, any thoughts?

 

[Lord Darkblade]

No its the 1639 Specs
(only linking because there does not appear to be a purchase option on this site, compaq don't do direct sales).

Its not a top of the line machine (not dual core or anything special) but it was fairly cheap (<£400). Now the real question is which is better, the 1800 or the 7800? Ok its probably a loaded question but is there a "winner" in this generation or is it a toss up again?