HDR looks great but it's such a huge performance hit. I just disable bloom/hdr and use 4xAA. Runs at a playable level while still looking pretty sweet.
I just hope this drops the prices of the 7800gtx, or at least isn't completely out of reach for the typical high end gamer. I didn't want to go with the 7800gtx originally since the price didn't warrent the incremental speed increase...