Another Peltier Question
 

When setting up a TEC cooled system, is it advantageous to have the ability to turn on the cooling system (pelt(s), water pump, rad fans) separately, to allow the pelt to cool down without load, prior to actually booting up the computer, like prometias and vapochills do?

It does help with over clocking – the cooler the CPU at start up the more it will overclock (generally).

I have a spare 350W Enermax PSU that's rated at 26A @ 12V. Could I use it to power a 226W 25A peltier, an 80W 7.5A peltier, a 9W DC pump and a 120MM Panaflo fan? If not, would something like a Samlex America 320W industrial be adequate?

I'll say you're safe. Using a multimeter, the 225W peltier I am using pulls an average 15 Amps @ 12 V.

A word of advise: You will have to watch out for the temps in the wires from the PSU used to power the pelt. They may not be rated for high currents and will tend to get too hot running the risk of a melt down as it was in my case. I solved the problem by spliting the load between two 12 V rails.