I think I've finally settled on 415/1130 for a stable overclock.
3DMark03 is 12860 (at stock levels 350/1000 my score was 11318)
3DMark01 is 24952
AquaMark Triscore is 70024
PCMark04 is 4873
This card has been amazing so far. I've got a 21" monitor so I play everything at 1600x1200 and every game (FarCry, UT2004, etc) has been smooth as silk with 4xAA & 8xAF.
BTW, I have seen a few comments about the 2D quality of these cards on this board. Let me tell you, don't listen to that crap. I have had a Matrox G450, BBA Radeon 8500 and BBA Radeon 9600pro and the eVGA 6800GT is just as good as they are at 2D. My 21" is a flat screen trinitron which is crystal clear. And I see no difference at all with the eVGA.