Yes i've also seen that gig card and it did catch my attention
obviously it does appeal but i could probaly reach the same level of overclock myself and save me a bit of cash.
I have been looking at the 5000 and now 6000 series for some time and for the price you get more card for the money. My main concern with ATI is there amazingly dodgey drivers. They seem to have a knack for making drivers that don't work properly. i've had serveral firends with ATI cards and only one who hasn't had any issues with there drivers