When I bought my TJ, I first invested in a snatch strap and tow hooks, a fire extinguisher, first aid kit, and a CB. To me, those are minimum requirements for hitting the trails. As has been said, a stock Jeep is incredibly capable and you're going to love it. The next thing I installed was a 2" budget boost; back in 2007. I chose the Rubicon Express BB; it came with shocks, bump stop spacers, and spring spacers. Retailed for ~ $250.00. I had great success with that kit.
I installed the kit myself. I'm an IT professional by-trade, but I wanted the hands-on experience of familiarizing myself with the Jeep. I'd recommend considering the install yourself; you'll save a bunch of money, and you'll value the experience. Folks on this site would be glad to lend you a hand; myself included.
Good luck with your build.