okay, i'll bite. what's the first?

 

bingo

I just read your first post, your an '05, so it's a torsion bar front end. You could get away with the factory 17's, again, it'll be tight, but they'll go. You should really look into a good set of wheels anyway, the no offset factory ones will have those really nice tires tucked up into the wells too far to be appreciated. Even if it meant holding off on the body lift a while to get them, go for the wheels with the tires.
My personal favorites are the Mickey Thompson Classic Locks or Classic II's and the Dick Cepek DC1's. All three have a 4.5'ish backspace and would look great on your 4x4. Also they are not very expensive for aftermarket wheels and are VERY STRONG.
Let me see if I got a couple pics:

 

I might be twice your age, but I ain't dead yet! Nuff said!!!

 

31570R17's is what you see here

 

I have 35x12.5 on mine and it only rubs at full turn a bit. and I cranked my T bars 2"(the sig pic is uncranked)

 

How much did the 315/70/17 hurt gas milage..I guess on the road it may help, but my truck is around town a lot.