cpu upgrade why are you a intel pawn? there is nothing wrong with the phenoms.
actually I have a Phenom II, before that an athlon II, before that an athlon x2, before that an athlon XP, so yes I am an Intel pawn. The original phenom's where not good quad core CPUs.
* yes the ATI 5850 is better then the GTX460 768. if you think that is what's keeping you from playing at 1440x900 by all means I think you should get two and run them CF.