You should be fine with either the RR 2.25" kit or the Rough country spacer, those tend to give good results.
I've been runnin' the OME HD lift in the front for about two years. In the rear, I had the daystar spacer/F-150 Monroe load levelers(give ~1" extra lift). With this setup, the rear still sat an inch lower than the front.
I recently got rid of the daystar spacer in the rear and swapped in a set of used 4" Superlift springs that I bought off another member. The XK now sits an inch higher in the rear, but the stance does not look overly "raked" or slanted forward. The best is looking at it in the rear, it's just like a Superlift, but at a fraction of the cost. Install was not too bad, just took a bit to get that drivers side rear UCA back in by myself.