on the build. It's kinda like the point when you grow up and start talking to the younger generation about the future - learn from other people's mistakes & do it right the first time.
If you TRULY do not plan to wheel the vehicle hard, and TRULY do not plan to ever go above a 33" tire, then build for that. Figure out what you REALISTICALLY will be doing with the vehicle, and know what you want the final product to be. You will be light years and MANY dollars ahead to do it once, rather than piece it here, piece it there, and then re-do it all when your thoughts or budget changes. Will it take longer? Yes - but it'll be worth it in the long run.
If 33's is your true max, plan for not only tire clearance, but also how it drives. I haven't driven a Jeep with a BB, so I don't know how they compare to an aftermarket lift. Aftermarket lifts (3-4") that replace springs tend to have a little harsher ride (at least in my experiences), but not extremely so. However, they do tend to give more clearance for the tires, as well as helping free up more space for flex capability.
Don't let people talk you into something you don't want. Build with the end in mind. Had I done that, my build wouldn't have cost me NEARLY what I have into it total. You can always save, buy parts & store them without having to make the Jeep a dog while waiting for other upgrades (i.e.- you can buy tires, but don't have to put them on until re-gearing is done, etc). And you can always post up here for advice or help - that's what we're all in this for!