If you want to get a lift on a budget to clear 33s, here is what you need
-2" budget boost
-2" body lift
-New shocks for 2" lift
The budget boost and body lift will cost probably around $400 for both and then shocks will be $200-$400 depending on which brand.
However, the proper way would be to go buy a 3" suspension lift and you should be able to clear 33s, and if need be a 1" BL.
As for the 31s hitting the fenders, you should be okay with 31s. If you leave the swaybar connected you will have no problems, but when disconnected it will be clear at full compression.