Mine is a 2 wheel drive, but I've been going through the same trouble trying to decide what exactly what I want to do. What I want to do is a 4" spindle with a 1" lift spring in front with a 3" lift block in the rear. You can fit 35s with only a coil spacer, but you run the risk of upper ball joint issues by putting the upper a-arm at too steep of an angle. Typically a 3" lift spindle is not tall enough to correct the upper ball joint geometry, but the 4" spindles do. I want a little extra tire clearance, so I'm going a little taller, and I do quite a bit of towing, so I still want a little bit of a rake to the stance. You could do a 4" spindle with a 1" lift block in the rear, you would have plenty of tire clearance and a level stance. The spindles don't require longer shocks, but any coil spacer, taller coil, or lift block, will require longer shocks. If you go up 2", you need a 2" longer traveling shock. Just my opinion as to what I am going to be doing, everyone has different tastes though.
I think you can get the Bilstein 5100 adjustable coilovers and be just fine.