Currently have a Rough Country 3.25" lift. Looking for for a 4" lift and narrowed it down to either the Rancho or OME kit.
Any experience or suggestions about each setup? Which one is more complete? Also, would it be okay to add leveling spacers ontop of the spring coils for an added 3/4 to 1" lift?

For the Rancho setup, I will be getting the Bilstein 5100 shocks.
Rancho 4" Trail System in Red for 07-13 Jeep® Wrangler & Wrangler Unlimited JK - Quadratec



Old Man Emu
Old Man Emu OMEJK4 - Old Man Emu 4" Suspension System for 07-13 Jeep® Wrangler & Wrangler Unlimited JK - Quadratec

 

I can only answer thru the experience of a friend. My buddy has an 08 JKUR with the 4" ome springs,, and he has the leveling spacers. ( pretty much what your looking for) He is running 37's with the help of bushwhacker flat fenders. His jeep articulates very nicely! It has since day 1; however, he has made some changes since he installed it. He is now running all adjustable control arms, and went with the Fox 2.0 reservoir shocks. It is seriously nice both on and off road. Other than that, my only advise would be to stay away from the Rancho shocks,,, but it looks like you already know that