I agree with the Above. LTC has been more more profitable at a lower entry cost. I have two graphics cards churing in two pc's when i'm not gaming.
i started in the summer and built up a nice chuck that i converted into BTC to do a couple of group buys.
i'm still mining LTC now, with a jalepeno and some erupters mining some BTC as well.
i had issues with finding a good usb hub for the erupters. i purchased a 12 port, but i could only get 5 to run at a time. my fault for not researching better.