I guess it is too late but if you would have went with the 8114's which will give a little more lift, you could have then went with the Z71's which would have added another ~1.5" in the rear. The Z71's would have also helped with your towing. Then you would have only a spring lift.
Honestly though in my mind from a safety/reliability standpoint there is very little difference between lifting with an inside the strut spacer(like RC or MarkMc's new lift) and the spring. These aren't jeeps where the spacer just sits on top of the spring in the front. One big advantage of going with the Rough Country or MarkMC 3" lift is they both replace the upper strut mount with a more solid mount. With those lifts you aren't really adding a spacer as much as a taller top strut mount. There are no more moving parts with that setup than with your OEM setup. I expect the stress on components either way would be the same with a comparable amount of lift. On the other hand replacing springs and not using the lift kits would likely perform differently but from a safety perspective I would think it to be the same.
The best option if you have the $$$ and must have a spring only lift would be the Radflow Coilovers. If I recall they are about $1k but you get a "spring only" lift with a rebuildable shock reported to be much better than what we currently have available. You can find more info at the following link.
viewtopic.php?f=15&t=3002&hilit=coilover