[Nay]

I'd start with tire size - 35's on an 80 due to its size are like 33's on a smaller rig.

If you are talking about trails like Golden Spike, then a 3"-4" lift and 35's is plenty. If you want to go up much from there to run the hardest stuff in Moab, I'd agree on fitting 37's, although that's more a damage prevention measure than pure need given we've seen 80's on trails like Rusty Nail. If you like Pritchett on up, then yea, I'm probably on 37's.

I would also choose between FOR and Slee 4". The reason is both are well balanced in up/down travel. OME J would meet your needs as well, although my personal opinion is you'd prefer the springs of the other two.

The 80 is a good crawler - to a point. It is very well suited to Moab. Trim up front and rear clearance and you are good to go with 35's.

I'm on FOR and 35's and barely scratched the paint on my rear bumper going across the crack - how you deal with bumpers in Moab is really more important than excess lift as most Moab trails call out approach and departure angles far more than breakover angle (steep but smooth ledges, not big rock gardens), so trimming up front/rear and choosing tire size and suspension balance are your key design components IMO.

Pull your flares and 37's should be a pretty easy fit if you want the bigger meats. Last pic is how 35" trxus fit on the FOR lift full stuff.