Once you make sure everything is mechanically fine, Id install a lift and tires. A new suspension system (IRONMAN and OME are common choices) is more important than bumpers because it's pretty much what everything else is based around. If you are positive that you want bumpers in the future, go with a "B" or "C" rated spring (B if your gonna have F+R bumpers and will usually NOT carry a load, C if you will have F+R bumpers and WILL usually carry a load). I have IRONMAN "B" springs and even without bumpers, the ride is VERY comfortable.
If you're sticking with your stock rims, most people then get 33x10.5 tires. If you're getting a wider rim (8" or 9") 33x12.5 is the way to go. Ive had BFG ATs on a lot of different vehicles and they are a great tire for light wheeling and on road conditions and last a long time. If you want a more off road oriented tire BFG KM2s are great. I have Toyo open county MTs and they are FANTASTIC off road.
Aussie lockers and other auto lockers are a very very cheap solution for a huge advantage in traction off road. On road they arent really that noticeable. I would highly recommend getting one for the rear.
After youve got that, then start worrying about crashing into stuff with new bumpers. Good luck.