Tires for 99 TJ... Please assist..

[Turtle]

Hi all! Although I have read previous posts about tire size, they have not given me the specific answer I am searching for. You have all helped me thus far with both my jeeps, so here is the situation. I REALLY need to replace my tires - bare to the bone! ( BFG A/T 235/75/r15 ) Unfortunately I am unable to purchase NEW at this time, and finding "nicely used" what I currently have on there is almost impossible. I wish to stick with BFG and can go bigger due to the lift on my jeep, yet the issue is, I have 16 jeep rims, with a 4 cy, (so I am aware the bigger the tire, the less power I will have, which is slim to none as it is.)
I would appreciate some input as far as tire sizes that I can search out that will fit my rims and also not completely take any power that is left over, LOL!

Appreciation for all of your input,
~E