PLEASE goodsir!, You will NOT regret using CGminer!!!, I procrastinated from using it for MONTHS, And to this day i regret all those days that i wasted staying with GUIminer, Trust me dude, CGminer is DEFINITLY what you want Use that, Or Since you have a 7970 Diablo Miner,

CGMiner!!
CGMiner!!
CGMiner!!
CGMiner!!

It will pick all the settings and do everything for you once you get it running!, Seriously! Use it!