defiantly sell it with the motors
if you do want to strip them you can make a bin of MLC (mixed low copper) but i have had a guy at the scrap yard not know what to do with the wire so now i make sure i put a lot of mixed aluminum in the bin.
and do not cut the wire out of a transformer it takes too long. trying not to sound like a link spammer but i have a video where i bust open a microwave transformer with a hatchet :) (my favorite tool)
http://www.youtube.com/watch?v=9ZairaXIeM8
it is the fastest way i found to getting the copper out