If you're tight on cash, stick with 3" and 31s. Then get out and enjoy your truck! Trying to get 33s to work right WILL cost money. There are ways to do it that are cheaper than others, but none are truly cheap. Then save up your pennies and go all out when you can afford do it right. The difference in ride height between 31s and 33s is only an inch. in my opinion, armor and driving skill are way more important than lift/tires.
Jeep on!
--Pete