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!
Why Diablo Miner over CGMiner with a 7970?
No specific reason, The Diablo mining Kernal is just optimized for 7xxx cards (from what i know due to the GCN structure), It comes built in with CGMiner, But there is also the standalone Diablominer