what size tires you looking to fit? if at all possible, i would try to keep the lift size down as to not raise your center of gravity. if your going for 35's i'd just get a 4" suspension, and get a 2 inch body lift from roger brown,
http://www.4crawler.com/4x4/ForSale/...it.shtml#FAQ10
body lifts aren't a bad idea, especially the way ifs is designed. Many IFS lifts require less backspacing on the wheels to clear the dropped A-arms, this in turn pushes the wheels/tires out farther from the body, making tire/body contact more of an issue. so if you get a 4 inch suspension, then a 2 inch body lift, rubbing won't be a issue, i just wouldnt get a body lift if you planned on jumping your truck, and if you planned on jumping it, theres other things i would strengthn before i do that. or, get a 4 inch suspension, and then get some bushwackers and trim the fenders and put the bushwackers on. theres many ways to accomplish what you want, the main thing is to keep the weight low to the ground to avoid roll overs. big lifts are cool to look at if you want to make a mall-crawler

but a good lift setup for a functional truck is better and safer. also, your gonna have to regear your axles for the new tires, probably another 1000 bucks or else your gonna lose rpm and power.
also, lifting your truck that high, your gonna have issues with your cv angles.
you can get a differential drop kit here: (
www.cornfedsuspension.com)
there are many different options you can take, and alot can be cheaper than a 6" fabtech. try going to customtacos.com great website for what your looking for.