RE 1.75" BB (about $200)
31x10.5 BFG AT's (about $120 a piece)
And see how you like it. That's honestly about as big as you can go and still maintain stock on-road performace, mileage, acceleration, and power output. Anything else would probably be a waist of your money since you don't offroad anyway (and that's not meant to sound mean).
2005 Rubicon :
4.0 Automatic,4.11 gears,4:1 Transfer Case
Teraflex 3" Coils,Rancho 9000x's,35" KM2's,(fenders...what fenders?), Cobra CB, Lowrance Baja 480c GPS,2"Wheel Spacers, Big Daddy Tie Rod,Superior Evolution Shafts.