Quick update: The transformers I was looking at have beecome moot! I just picked two nice 24V CT 12A transformers from the trash and will run them in series in order to get the rails I want for some LM3886's. (See my dumpster dive thread if you want some pics!!) My idea was to tie one end of each transformer to ground and the other ends into a bridge rectifier. Any more comments about that? I know I have to be aware that both stages are in phase so that I don't set up a short circuit, but other than that, are there any suggestions?
I had thought about putting a diode inline before the ground point, but I figured that was asking for trouble since it would set up more of a potential for ground loops (at least if my logic is correct. . . . ).