I've beat my brains out on this topic for the last two years. I too am very displeased with the whimpy power of the 3.0L V6.
My searches have come up with two solutions:
#1 Swap the motor for a 4.3L GM
#2 Swap the motor for a 3.4 Toyota
Advanced Adapters has the stuff to swap to the Chevy motor.
I am swaying towards the Toyota 3.4. Off Road Solutions has the necessary kit to make the swap
http://www.offroadsolutions.com/later,
devro