lockers yes, arb air front and rear, or go detroit rear and air locka front.
yes min 3" for 31" tyres, but that "MINIMUM" you will gets lots of scrubbing with that, 4" would be better.
gojeeps would work yes. sway bar discos also a must, if you on a budget, just put wing nuts on the top linkage and takes about 3min to remove with a little fiddling.
arb do a bullbar for 97 onwards, but if your putting 31" tyres on the side wings of the bullbat go right back to the flare, problem with that is that with the sway bar off your tyre will hit it, you can get it trimmed off and re-welded but the better alternative is to get a pre 97 arb bull bar. wings are shorter to match earlier design. wont look as stream line but works better.
i have a fulcrum lift in my rig, its 4" and cost about $1500 plus fitting, contact mark smith user name smithy on here if you want to find out about that. goto
ausjeepoffroad main site to find out a bit about my 98 model which would be the same as what you are looking at.