I bought a superlift system for my 71 Jimmy. The quality is very nice but I think the springs are too stiff for my taste. If I were you I would use either BDS or Tuff Country springs for the front. All I have heard is good things about both. For the rear I would personally use a shackle flip. Check out
www.offroaddesign.com. They make a 2 1/2 and 4 inch flip. So you could use the a 4" flip and your stock springs or the 2 1/2" flip and pick up some 2" rear springs.