What part of the AD7792 to you consider too complicated? Is 4 pins too many, or is the SPI and all the messing with registers?
I've got a parts order going in Tuesday, I could tack on a couple AD7705s and write up a new tutorial and library if it is just software complexity that is the problem. (I won't move to surface mount until autumn so the AD7792 is out for me, but they look similar in spirit. The registers are different, but the same ideas.)