I had a Pro-Comp 2" spring lift in my first Jeep. (I went with the cheap ES3000 shocks and they were VERY harsh!) Other than the rough ride, I hated that the front only came up 1.5" even though the rear came up exactly 2". Made the factory "rake" look even worse. Front end weight was all stock (4.0L emgine) and the rear was stock except for not having a back seat. (I put the seat back in one day and it MIGHT have brought it down 1/8"... not noticable.
My point is, when I put a new lift in my current Jeep, I used spacers because I knew the lift would be 2" front AND rear. Most of the spring lifts don't give you the lift they claim to. Some give more. Some give less.
Also, if you choose the RE BB, spend the extra money and get their monotube shocks. One thing I will recomend against is the set-up I'm using. Stock springs, spacers, & OME shocks. Compared to stock shocks with under 10K miles, they ride pretty rough. The ride is only slightly better than the awful Pro-Comp kit I had. And that's probably only because it came with stiffer springs.
2006 Jeep Wrangler Rubicon