If you want to maintain streetability, I'd say 2.5 inch lift with 31s. If you have a 6 cylinder, you may need to regear eventually with anything above 31s.
My cousin had 33s with a 4" lift on his TJ for quite some time, but after many hard off road excursions, his local shop (who was supposed to do an alignment for him) told him his Jeep was not suited for street use because the Jeep was so beat up underneath lol. He went down to 30's last week, but he rolled his Jeep on the road recently because he had to swerve out of the way of another car.
My friend has 31 BFGs on his TJ. For a 4 cylinder Jeep, that thing does good off road. Better than my stock YJ lol.
My stock 28s suck.
Btw a 2.5 inch lift with 33s would be a tight fit. If you want 33s, id go 4 inch lift
Ive got a 92 white yj