Best recommened Graphics card

[Argonaut110]

Hi,
I'm looking to play Cliffs of Dover on high/max(ambitious but rubbish i'm assuming sadly...) settings. Sadly, my Dell Dimension 9200 came with a Nvidia GeForce 8800GTX, and that just isn't good enough.
So what replacement card should I get to play this game on high/max settings? My budget is £0-80, the card has to be 1GB or above and my PSU is 375 Watts, although I have heard 400 watt cards can run on it. I was looking at an ATi Radeon 6770 and a GeForce GTX 550, but if there's any better cards out there please let me know or pick the best one out of those two. Thanks!

A

*I will also be playing FSX, KSP and Il-2 1946 and will genrally use this PC as a gaming machine, so try and recommend a card for overall use and not just Il-2 CoD.

*I also found a list of cards that will fit inside my machine. Please can anybody tell which is the best out of these PLUS which will set me up for the future:
GeForce GTX 550 Ti
Radeon HD 7770
Radeon HD 7750
Radeon HD 6850
Radeon HD 6770
Radeon HD 6750