I can't argue against using the RE kit. They make high quality stuff and if you can afford it, I'm certain you'll be happy. :D
I went with 33s on my 88 rather than 35s because 33s fit better, are easier on the drivetrain, and work well with 4.10s. Don't forget to upgrade the shafts/Ujoints in the Dana 30 to the later model XJ units that use Dana 44 sized joints and delete the CAD. Also, if you go with 4.10s, it may be cheaper to get a 4.10 geared Dana 30 form the junkyard than to have yours regeared. Get one from a 96+ and get both the 4.10s and big joints in one purchase! :D (the big joints are found earlier than that in XJs that have ABS, but few 2.5Ls were paired with ABS and 2.5L are where you find the 4.10 gears).
What will be your trail-to-highway ratio? What types of terrain do you visit?
And you might want to research the AX-15 conversion.
Jeep on!
--Pete