Just a quick clarification, when you say "I'll have trouble with it" are you saying "trouble running it period" or "trouble maxing it"?
Trouble maxing it.
Yeah, you won't be able to max it, but you'll definitely be able to get above that picture.
Assassin's Creed, or the recent games I listed?
Ha, the ninja has been ninja'd!
a 5770 is slightly more powerful than a 260, so getting a 250 instead would be dumb. Also whoever mentioned a 5870 I think those are still over $300
The answer is no. To do that, you'd need to have a 5870, maybe a 5850.5770 would be able to max with AA at around the 1280x960 region. For the latest games, at least.