Single 6770 card produces ~220MH/s so about ~0.022btc per day per card. That's my guess. :p
Anywhere from 450-500Mhash/s with RPCminer....
My bad, they were running Phoenix 1.50 on the setup they had. And it went a little something like this:
-k phatk PLATFORM=0 DEVICE=0 VECTORS BFI_INT WORKSIZE=256 FASTLOOP=false AGGRESSION=13