ladyfrog, first of all, i just want to say that the coil manufacturer you have listed above put your front coils at 138 per pair because that is our deal with them, that is the coil manufacturer i use. i don't know why they want to charge you 186 for the rears unless you had them do something secial, but the ones in my kit are also 138 per pair. the total for the kit is 350 plus shipping. if you get the mounts seperately, it will cost you a little more. if you use tj rear coils, the ride will be stiff as dennis has pointed out, but then so might it be with the 4" lift from me, as shifter26 has said, not to mention the necessity to lengthen the panhard rod or alter it's mount to re-center the rear axle. you asked earlier if it would be possible to alter the coil seats top and bottom in the front to accomodate a different coil, and yes, it would be, but it would be a lot more work than is necessary, believe me, i have thought about this and other possibilities for a very, very long time. Eibachs and spacers or custom coils and new upper strut mounts are the only way to go for 4" up front. Mazda MPV, TJ and custom coils are the only way to go for 4" in the rear and you still have to fix the panhard length issue.

one major note on all this: it doesn't matter what you do as far as lift, all but the stiffest will sag unless you also alter the linkages in front and in rear. if you don't, the linkage angles are working aganst the coils more than for them and causing more wear on them than simply keeping the vehicle at a certain height.