[guandi]

*cracks knuckles* Now this is my kind of project.

I have done similar myself, i have used engine rads out of Ford Fiesta's, Toyota Hi-Aces, Mercedes Sprinters and even a Volvo FH16 (thats a 40ton truck). just for the hell of it really.

I have used an Eheim 1260 for the Ford and Toyota, and Dual 1260's for the Merc and Volvo just so the head was good enough to get from my garden to my room. It was originally for silence, but eventually for pure overkill.

A Eheim 1260 should be sufficent for 2 loops only if they are identical, if the loops are different i suggest a Eheim 1250 on each.

Hydor pumps are a no-no in this sort of system, for some reason they fail on me all too often.

However....

If you plan on using a multi-loop, a loop for each system and a cooling loop, you may need 2 1250's and one 1260.