My current one is 300, so I was planning to buy a new one when I got a new GFX card, but if I buy the 6870 he basically throws it in for free (850w ThermalTake)
it went from a 650w to 850w PSU? is it the blackwidow 850w? it's a solid enough PSU and you won't notice much difference between the two video cards. sounds like a solid deal.