Foam Cell Pro kit will get you 3" front and 3" in the back, and they have options to accommodate heavier/lifted rigs with more weight. I'm running the "Medium Load" (0-110#) setup on my GX, which weighs about 5300# dry, and they ride a bit stiff empty and ride great when the rig is loaded with gear/people up to about the 6000# mark. If you want the "heavy load" kit, it looks like they only go up to 2.5", which I'm betting is due to the springs and not the shocks. You could probably get the heavy load kit to 3" front and rear with small spacers on the front struts and rear springs.
Designed for and used by the US Military, Foam Cell Pro suspension systems require less maintenance than other performance suspensions and are rebuildable by design. The Foam Cell Pro suspension lift kits are the strongest and most reliable and will serve you for a lifetime. Built for...
ironman4x4america.com
You might be able to snag a kit for 20% off next week on Black Friday. The Stage 1 kit is basically the same cost as buying the front coilovers and rear shocks separately, but comes with rear springs and the KDSS bar. You could probably sell those parts (or your old parts) and makeup some of the cost. Plus, your old Icon coilovers and shocks will still have some residual value - even if they need a rebuild - so it could be a relatively low-cost upgrade.