This is really easy. If you want a mild lift of 2", go with the
Old Man Emu. The very best, the best ride, the most money. If
you want a lot of lift, go with a SOA kit. The most lift, stock
ride, lots of money by the time you finish. Don't bother with
the 4" spring lifts, they ride lousy compared to SOA and cost more
than a SOA kit.
Whichever way you go, plan on new brake lines, a SYE kit, new
driveshaft, etc.
Personally, I love my Old Man Emu lift. But I also only run
31" BFGs. And I can push them into the top of the fender on
occasion.
Ron R. - 90 YJ w/OME