Need to replace rear air bags w/new shock strut kit

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Hey everyone,

new to the forum here.  I own 05 GX 470 for roughly 10 years.  It has 238K mikes on it. Runs fantastic and I love it.  Problem is recently the rear air bags have both blown and I need to replace. I was already considering a lift and a few other mods in order to make it a mildly converted off-road/overland vehicle.  Shocks/struts/arms…..all of this is Greek to me so hoping that some of you could provide some great conversion ideas/tips for me?  I took it to local Off Road Warehouse and they quoted me $4K for the rear replacement/lift.  This was with an Icon coil over.  
 

thanks!
Chris