Yeah, but the HD 5850 is almost identical in performance with the HD 6870, and you can get good deals like that on it.However, if the OC is planning on doing Crossfire in the future, the HD 6870 is a better option.
It's actually the best bang for your buck out there now, but it's a bit underpowered. It's still worth it though if you intend to crossfire later this year. Two of these in Crossfire should best GTX 570/Radeon 6970 performance for under $200 total (assumed since two GTX 460's handily trump a GTX 480, which is more or less a GTX 570's equal).
EDIT: I'd also consider the $190 (after $40 rebate) Galaxy GTX 560Ti on Newegg.