If you are going to spend the $2500 on the truck and you want the end result to be 35" tires.
Do you want to run 35's for looks or do you want to run 35's because they kick ass on the trail on a 4 door Ex?
For offroad first I would spend some removing the body lift, or at least reducing it.
then consider the suspension:
solid axle swap is your best bet for running 35's
35" tires are really pushing it for the D35 ttB. You can run them but you will be come an expert at wheel bearing maintenence and you will want some spare hubs/parts.
A D44 solid axle would really hold those tires and then some. Besides everybody is doing it! There will be so many solid axle Explorer's out there you will think Ford made them! There is a good reason behind that, they wheel like mad!
So it really depends on what you want to get out of the truck.
Also they will not clear with merely a 5" lift, you can run flares, trim the stock metal, or run fiberglass (or keep your BL) Personally my truck is already to top heavy to raise the center of gravity more so I want to avoid the body lift for 4x4ing)
then get a locker or two and like above I also recommend a steak dinner and some flowers for your GF who is now pissed about the amount of $$$, work, and time you just spent on your project truck
hahaha