Thanks for the suggestions!
I'm now in the process of trying cgminer on some other cards... some MSI Twin Frozr 7950's

My cgminer settings are as follows:
(first setx GPU_MAX.....)
cgminer.exe --scrypt -o stratum+tcp://poolurl -u username -p password -I 13 --shaders 1792 -g 2 -w 256 -s 1

And with my 2 7950s I'm getting 520 kh/sec and 484 kh/s

Anyone getting better speeds with these cards? Or, any suggestions for the settings?

Thanks!