I have a 2007 F150 4x4 Lariat with the 5.4 triton.

I have a leveling kit on it. Should I run 33s or 35s? Im getting aftermarket wheels. what backspacing do i need?
Also I'm thinking about getting the Toyo open country mt, Kumho KL71(Road venture mt) ,or the Pro-Comp Xtreme MT? Opinions?

Any help is much appreciated.