I don't think a 14 bolt would be the best axle for you in the rear. Sure, its strong as crap but its also huge. It hangs a lot lower then most other axles and unless your planning on running 37's or larger I wouldn't bother with one. If you want to see exactly what I'm talking about, look at my build thread in the wrenching section on here. I have pictures in there of how I cut the bottom of my 14 bolt off and welded a 1/2" plate to the bottom of it to save ground clearance.
Just to put numbers to what I am talking about here, I pulled this information from my build thread:
Dana 30 = 4 5/8"
Dana 44 = 5 1/2"
Ford 8.8 = 5 5/8"
Dana 60 = 5 7/8"
14 Bolt = 7 1/4" to 8" Depending on what write up I found (Stock Numbers)
Those numbers are from centerline of the axle tube to the bottom of the differential. If you think about it, the difference of a Dana 44 to a 14 bolt is 2" of clearance at the differential. That is the equivalent of going from a 33" tire to a 37" tire, so it is a huge difference.
Your best bet is to find a set of Waggy axles, front and rear. They will be the right width for your CJ. Also, it will be easier to find a set with matched gearing. If you are trying to stay on a budget here, they that will be a big plus.