Clarke, I understand your thoughts on cordless tools & if you don't want to change your mind, DO NOT use a 18v cordless impact driver (for running screws). So far, everyone that has used mine has bought one for themselves. It replaced my air nailers as the most fun tool I own. (BTW, the port-a-band & mig welder are always in the top 5.)
I got a 18v impact driver as part of a set from Makita. It has a 1/4" hex connector so it is really only for screws. I almost sold it when I got the set as I thought I would never use it.
I'm glad I didn't sell as it is the most used tool in the set. I think I used the drill once or twice, but the impact driver all the time. I think it may be lighter than my 12v drill. It is really handy for removing screws on the bus. (I'm not ready to put any screws in quite yet.)