At least for the Tec on dangerden (152w) you might want to consider a bench power supply like the one at:
http://mpja.com/product.asp?product=12640+PS .
It matches the 152w perfectly, slightly low on voltage but you dont run the pelt at 100% anyways. Its hard to find a bench that matches amps and voltage well. This one does up to 25amps but is adjustable from 0-15volts.
There are one or 2 others out there but the other close match stops at 10amps with higher voltage. The rest are little 3amp types or fixed 12.5v models.