33" with 3.73's with an automatic in my opinion is the limit, this is what I am currently running and I may still re-gear. You can do a lot with 33's and if it's your daily driver, gas mileage won't suffer as much as with 35's. Currently I am running a Teraflex leveling kit and I still get a little bit of fender rub up front off road with 33's when the front sway bar is disconnected. I do also have an ARB front bumper and a winch so it's possible it wouldn't be an issue without. Personally I don't see how Free Beer is running 37's off road with no lift but maybe 2 door is different or he has flat fenders. I can tell that the stock springs are really too soft to be loaded down. I am going to go with the new AEV 2.5" progressive spring lift which is due to be released any day now for just under $900.
http://forum.aev-conversions.com/showthread.php?t=3597
Everything else Free Beer suggested is a good idea as well, I would figure out your tire size before you go with lockers as if you do decide to re-gear you will save yourself a pile of money doing gears and lockers at the same time.