Nice looking truck. I really like the color scheme you have going there!
As for motors, If I would stick a diesel in my truck I would choose the Duramax. That is one bad ass motor!
I'm guessing a Cummings is easier and cheaper to come by though.

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2003 Supercrew, 4x4, 5.4L, 6" Fabtech Lift, 3" PA Body Lift, Superchips Tuner, 38x15.50x20 Toyo M/T's, 20x9.5 Procomp 7005's, Yukon 4:88 gears, 40 Series Flowmaster Dumped, 3" AF1 Intake, magnaflow cats,
Firestone Air Helper Springs (waiting for install)
Wish list(in order): Headers(maybe OBX), true duals w/super 44s, SUPERCHARGER!
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Thanks for the SIG krusedisc!