Jim,
I was in your position a few months back and decided on the Rancho 2 1/2 inch lift. It is a bit more expensive I got mine for 719+shocks. For the additional 500 I got extended radius arms, a drop pitman arm, grade 8 fasteners, brake lengthing brackets(which I am not using-got new lines), extended sway bar links+poly bushings, plus extra reinforcement for the bracket that supports the Pass Side axle. In my opinion all worth the extra dollars. Ive been installing it my self and am impressed with the quality of the materials, the instructions are good not the best but good enough.
If cash is the only consideration then the Duff seems to be it, but I think the Rancho is a better value.
I should be finished this weekend( if I can get the time). Cant wait to get it on the trail.
Now what tires....