Diesel truck question

[bottledbird68]

Ok, so I've had my eyes open for the right deal to come along on a diesel truck. Eventually I'll most likely ditch the body and use everything else under another project I have so I'm mainly worried about the motor/chassis combo.
Basically, I'm not hellbent on cummins/duramax/powerstroke so I'm looking for opinions from people who have dealt with them all. What's the best diesel truck platform as far as durability/power potential?
Opinions welcome. May buy something soon, or not for a year, but trying to decide what to look for?