Guild is truly the 12 of choice, although you can find the occasional one in other brands that have a great sound. Guild also seems to be (around Mudcat at least) the choice of discerning thieves, and you don't have to count Brother Fielding in that as he has owned 2369 guitars of which 834 have been stolen. Do I have those figures right RiB?You also might check with the Implosive Pedro Guitar Company in Tejaxawatchi, Mexico. They make a 12 that can be tuned to standard 6-string pitch, and when left in a closet overnight, I'm told, have a tremendous sound. Again, check with Rick Fielding.
Play a lot...you'll find one.
Spaw