I asked a similar noob question once.
I've found that the most popular off-the-shelf setup around here is using tuff country. This appears to be motivated by the fact that they have decent spring rates and are also sold by Off Road Design as part of their more specialized lift packages. Seems to be the best bang for the buck.
If you are into hardcore wheeling as opposed to street driving then the shackle flip in the rear, plus a zero-rate spring and an angled shim seems to be popular. Also wheeling guys like to go to longer leaf springs, and relocated hangers and shackles because the longer leaf yeilds less torsional resistance while having a similar linear rate. This is good for solid axles flexing in opposite directions.
Either way you'll also want a good set of dampers to match the springs, and you'll need extended brake lines, and you'll need to assess drive shaft lengths, pinion angles, etc.