Upgrade question

[Red_Star]

I am thinking about upgrading my video card, but I dont really know what to get. I am using a 1950XT 256mb right now, but I dont think it will hold out, as games are getting much better looking as time passes.

So I really need advice as to what to get. I am an ATI fan, but I might get an nividia depending on what you say. I have never had one I liked, but that could change. I just need a decent card that isnt going to kill my wallet..

*EDIT*
Games I play frequently:
Crysis Wars
COD4 and 5
Fallout 3
want to play GTA 4, but it just wont do it...

System specs:
5600+ X2 2.8ghz AM2 CPU
Gigabyte P series motherboard (dont know the exact one right now, but it is PCI-E)
1gb corsair dual channel ram
that should be all the information needed for now, but if you need anything else let me know...

 

[Valset]

more info? what games and your system specs. monitor size and such. right now you can get a 4870 1gb or a GTX260 for under 200 dollars.


edit, and your budget