I hate my 5770. When it’s behaving it’s fine but I’m constantly having issues with it and none of them are repeatable enough to RMA the card. I would look at getting a high-end GTX260 or GTX275, if nothing else you know they’re always going to be reliably the same performance regardless of the game or driver version.
I got one of these a few months back and love it:
http://www.newegg.com/Product/Product.aspx?Item=N82E16824001338&Tpk=samsung%202494
Nickname will rage because it’s 16:9 (1920×1080) instead of 16:10 (1980×1200) but it’s still a beautiful LCD and is solid for the price.
Also, what’s the make/model of your 8800GTX and is it still under warranty?