Deciding on 2WD or 4WD was the toughest decision I had to make on mine. Still not sure if I ordered the right one, but when you need 4WD, you need it. In AZ, I really don't need 4WD, but if I ever moved back to CO, then I would want to have it.
Lowering the 4WD by removing the spacers helps a lot with the height, but doesn't help the milage like a 2WD would.