I ordered the card the day it became available on New Egg - $69!
GRID plays fine in HD with some minor tweaking of the shadows and other minor things that don't effect the overall look very much.
I'm having some minor problems with Vista at the moment so I haven't played any games for awhile, but I will soon re-install Vista since I installed it over XP and I will go with a complete clean install as I believe the upgraded install is the cause of my problems.
Once I sort that out, I will try some of the mods seen here. I also might upgrade to Crossfire'd HD4670's, but I need a Crossfire motherboard.
Here's a video of a replay of me playing GRID -
I think I posted this before, but ADD ME PLEASE!
I don't buy gear often enough, but this is my 3rd ATI card.