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.