Best & Cheapest don't belong together in the same sentence.
Have a read through the forums, see what people have been using - ring around for a few prices because they often fluctuate.
I'm running the following and it really only gives me 2.5' of lift.
These parts aren't the cheapest, in some cases the most expensive on the market - but I think gain the best results
Calmini UCA - everyone else copied there design for a reason
Calmini IAB - 6 to one, half a dozen to the another
Bilstein Shocks - best quality ride hands down, longest stroke
EFS comfort torsion bars - designed for the extra lift, not much stiffer then standard
Ball joint spacers - lets me back off the torsion bars a bit, gain more clearance and droop under the UCA & droop stop
Diff drop kit - lowered the diff nearly 0.5' not huge but was easy enough and every little bit helps the CV's