8800GT 256 or 512, 9600GT OR 3870

I play ona Dell 17" moniter so I'm just wondering is there a need for 512MB of memory? The only game i play is COD4 and will be for a while yet. I will play newer games as they come out but COD4 is the main one!
The 8800GT 512 and 3870 are just out side my price range, and I'm in Ireland so no Newegg for me
Thanks for the help guys!
Shed

I'm going to take a guess and say you are gaming at 1024 x 768 on a 17" monitor, and as the previous poster said it is really hard to reccommend something without knowing the full system specs.

That being said, for a someone on a budget the cards I would personally reccommend in general would be a 8800GS, 9600GT or 3850.

All of those will breeze through COD4.

I am running a Dell 1703FP

I game at 1280x1024 with the games that I play on full:-

P35
Q6600 @3Ghz
2Gb PC6400
8800gt -512Mb

Yeah, I would say the 3850 256 or the 9600GT 512, either of these would be fine doing 1280x1024 in COD4. Both of these cards are under $200. I actually got a 3870 for $179.99 (in Canada). The 8800GT 512 is the best card in the bunch, but it's usually over $200.

This is a very good buy i would think you will be hard pressed to buy a better card at this price/performance point.
Mactronix

Found an open box deal for a 3870! 125Euro better than anything by 35 euros and its a gigabyte with custom cooler!

The 9600gt and the 3870 are somewhat even in performance. They each beat each other in different tests. I would recommend going with the one that you can find cheapest if you're not getting the 8800gt.