Take it from someone who went to big tires from 33s- 33s and lockers will do more than you think and I had more fun with my YJ in a simple, mild state with skid plates, lockers and 33 all terrains than any other form. I wish I would have kept it that way. Don't get caught up in the build thinking you "need" certain parts to go have the fun you want. Every friend I have ever talked to that went 37s and bigger regretted it. Going that aggressive makes most trails on the east coast a walk in the park, and having a rig that is super capable without a couple years of experience wheeling turns a person into a shit driver. I know the temptation is there to make something really cool but for a first offroad vehicle don't go wild right away. Throw some 97-99 xj axles in it with lockers, design some skids to protect your vitals and rockers, and go have fun while you learn to drive and properly choose your lines.