The RE 2.5 w/ Bilstein shocks seams to be a decent kit from when I see on the forums.
2 door or 4 door ?
RK will net 3.5 on a light 2 door. Something to keep in mind if on a budget. You're prob better off going with 1.5 if going RK w/ a 2 door.
RK = triple rate progressive RE = linear coils.
RE provides stupid cam plates for front caster angle. I recommend some sort of caster correction at 2.5 (and not using cam plates) W/ either kit.
The RE setup with shocks is a better value. RK is a better brand IMO.
Check w/ Marcus @ River city off road here on the forum. He's put together some killer RK packages on his site.
Pair w/ Rancho 9000 shocks and take advantage of the currant rebate offer. ($250 ish for 4 shocks)
Hope this helped .. Good luck
2007 JKR | PSC Big bore box | Rock Krawler 3.5" x-factor arms l SteerSmarts YETI track bar, tie rod, no drill flipped drag link, Griffin | Synergy frame brace | 37x12.5x17 Nitto RG's | Dana front DS | Fox IFP shocks | Artec front armor kit/Currie JJ's | Teraflex rear axle bracket | EVO Rockstars | Ridged D's, A pillar mounts | VKS sliders l Trek Armor seat covers | Superchips/Sprint booster | Savvy half doors w/ Bestop uppers