Hey Craig

As far as I am aware, the driver issue is not yet fixed in SL - maybe someone else could confirm.

4870's seem to be the best bet at the moment - I have tested the GTX285, but the performance is not quite as good, although it does have two DVI sockets. I would use a miniport adapter to DVI - just use some cable ties to keep it in place.

The newer Mac PRO's have a different sled size to the earlier ones - longer side 'arms'. I supply the ones from Maxupgrades in the US - they do both sizes - so you could source from them. They are superior to most as the have a built in heatsink to help with drive cooling. Their part number is SZ-VRMACPRO9-01 - goto www.maxupgrades.com

I hope this helps

regards

Nev.