If you are using OEM Rubicon springs, the go with the OEM Rubicon shocks.  If you going to put in a 2" BB, then use the RE shocks.  The Rubicon springs aren't really much longer, they are stiffer for the added weight of the Rubicon package.  IE: My 3" lift wound up being 4" because I have a 4cyl and a soft top.  If I had the 6cyl and a hard-top, it would be 3".  You can expect something similar, like 1" - 1.5" using Rubicon OEM parts.  Don't forget to align it!