how about adding some hd 7950 instead? they are really cheap and perform very good, 640 - 650 kh/s each for me, with some overclocking i can get two of them at 1.4 MH/s.. right now they make more or less 0.04 btc a day, and i dont pay for energy.. not bad for 2 cards.. im planning to add more hd 7950 of course 

i tried mining on feathercoin and other coins pools but it was kinda messy, all the clients, all the logins.. i switched to a middlecoin, that way its more clean, one wallett, no logins..