I just switched to CryptoTrain using lasybear's X11 mods:
https://bitcointalk.org/index.php?topic=623409.0I have not had a chance yet to compare them to LTC Rabbit, but I am seeing 3.3/mh - 280x and 1.9/mh - 270x. I am not pushing the cards as hard as I can yet, I'm just testing stability.