I was running 7 7970's for a couple of days and have been slowly buying ASICminers to replace them since I dont care much for the heat and power use of the 7970's. But I figure if I cant get the ASICminers below 60.00 each I would be doing ok. It just takes some looking arround a resisting the urge to buy everything I see in order to build up GHZ.
with 7 7970's - Not overclocked - I am geting about 3.1-3.4 ghz.