Suspension lifts can be done relatively cheaply if you look around for the right parts.
Try sourcing some IRONMAN suspension parts, they do a lot of stuff for older model vehicles.
I've just done a 2 inch lift all around my Pathfinder and apart from my having uprated suspension (about 25% more solid) and it's being very solid on the road, it's brilliant.
Personally I'd steer clear of a body lift until after a suspension lift is done, it's a false economy otherise. Check out my comments in this almost identical thread:
http://www.thenissanpath.com/viewtopic.php?t=5603 it might help.
But hey, your truck, your money, go with whatever feels right for you, but a body lift won't lift your chassis off the ground (which is what scrapes!)
Good luck whichever way you go.
Simon