XFX works great, except the 5770 loses the DP in 10.6.8 and Lion.
I may grab a 68xx if it continues to work for those. I have triple monitor with GE yes in 10.6.7, lose it in 10.6.8. Sticking with 10.6.7 until I identify a card that works "native" with 3 monitors in Lion, then will probably upgrade.
You can use the 10.6.7 kexts in Lion, but I would rather spend a few bucks and not have to worry about it. If folks can figure out how to get the DP back in 10.6.8/Lion with what I have that is great too.
If only running 2 monitors both DVI out work great in 10.6.8.
Be careful which XFX, I know mine works OOB with GE=Yes...But it is the older one...