We found some new tires and rims on Craigslist.  These will replace the current stock rims and 31's on the jeep once the lift kit is installed.  We got what we think is a good deal.  It would have cost us just as much just to buy new rims.  These new tires are 33 x 12.5 and have a much more aggressive tread.  I mounted one up just to see what it would look like.  Can't wait for the lift now!