I've pretty much used 12 for residential apps also. Seems it was easier w/ the 20A circs, as I could cover more space w/ less circuits.(used to do some big houses). If you plan it to use the uncrowded (ie. smoke detector) boxes for your junction points, there's really not much prob w/ box fill. Circuits? Bill's got the ticket here. The Gen Circs are a great idea.
