OMFG, I paid like $100 more for each of mine. That one is the eyefinity 6 edition with twice as much RAM! AAAAAAAAAAHHHHHHHHHHHHHHHHHH
Anyway, yeah that 5870 is an awesome deal. If I were you I would upgrade that PSU though even if you just go with the 460. Your CPU will likely be the limiting factor for you in games though.