As far as budget boost go, any kit is fine because Its only a budget boost...There aint a whole lot Involved...
Rusty's would be fine, I also think RE makes a nice budget boost, Im sure Bob Suplee would get you a great price on. Go with either the Rustys or the RE6160 If your set on a budget boost, Its add leafs rather and blocks or shackle, and It comes with shocks.
If you go with BPE's It will add about 1", you shouldnt need new shocks, but hey If a kit comes with them that cant hurt....but I wouldnt go out and buy new shocks unless your stockies are shot. If you run both that shouldnt hurt either, Just flex and make sure your not over compressing them, If so bumpstop accordingly.
Either way go with a shackle or add leafs, stay away from the blocks cause they will prematurley wear your stock pack.
As far as tires...you should clear a 30x9.50 easily, and a 31x10.50 you could clear with a tiny bit of trimming, nothing to serious...