Hmm... $220 shipped wasn't reallly what I was lookin for. Oh and it goes $310 new. Where do you live? As in, what state?
As the 600 series is nearly out, I'm sure the prices of your card should be dropping.
The only difference from the HD and other series is 797 Mhz (vs. 732 Mhz Reference), it can easily be attained by OC