I'd give cgminer a try. It's not that hard to use, and you get a lot more controll over your cards. I used guiminer for about a day, and gave cgminer a shot. I'm not going back. I've been mining on 4 7950's for less than a week. Have about .5 btc in profit. Not as much as I though I'd make... I need to hook my other 2 new 7950's up, but don't have any room in the computers case. Maybe I'll get a riser?