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I actually think that the 93-95 rims would be the best for aero because they are the most smooth and have the least amount of holes. It's probably not the lightest in the group.
I'm pretty sure that in 99 they changed the lug spread and they won't fit, I don't know about the wrangler ones, but they are 8 inch rims, and I'm pretty sure that the ZJ has 7 inch wide rims.
the waffle rims would probably be lighter than the 93-95's.
I don't think you'll overheat the car, for one, when I go muddin, my temp doesn't really rise, 10 degrees maybe, and that's with a grille block. but that's winter.
To judge how much to block, just block off a little at a time, and when you see it start to overheat, take back some of the block. One thing is, definitely block off the grille hole where the air intake is, mine is the very left (driver side) grille slot. Even though it doesn't get air directly from there (if you look, it takes it from the side) it still prevents air from getting in that part of the cabin and lets warmer air go in, warming the engine about 20-30 degrees.
Really, you'd have to look at weight first, then consider aero, because the lightest rim can still get pizza pans put on if it's not aero.
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