I'm going to weigh in, although most of the similar opinions have already been made and I will be repeating some of what has been said. Kurt's advice/opinion is spot on, as usual he and has the offroad driving experience to back up his opinion.
Most people's 'expedition' trips are nothing more than car camping trips with offroad driving to & from. Most working folks trips will be weekend trips... 3-4 days at a time, max. Vehicle selection should be made with this in mind.
Personally, the most important items for me are; Reliability, Capability and Comfort. I do like having a vehicle with some power as well.
One thing I'm big on is having a vehicle that is capable of getting thru the unplanned, rough stuff. You never know what nature is going to do to your intended route when traveling in remote places. Bigger tires and lockers will usually help... I don't like turning around when the road gets rough. This was from a local day trip last year and we could have back tracked, but I figured we were prepared enough to get thru. If I did not have 35's and lockers, I would have turned back.
Larger tires roll over and thru the rough stuff easier... they also rob power and mileage. My GMC build is intended for back country travel, with the idea that when things get rough, the truck will be totally capable of handling it.
On the other hand, our '03 Toyota 4Runner has nothing more than an Old Man Emu 2" lift and 265 BFG AT's and it's a great mild-trail backcountry rig. It's been over Black Bear Pass, we've camped out of it and it's great for covering lots of miles in the dirt and on the road. Good power, excellent traction control, reliable and fun to drive with the V8!
My question for you is, where do you want to go? How rough of a trail would you like to travel? SUV or pickup? You need to decide if IFS is plenty or you need a solid axle and go from there. Your budget dictates your choice too. Make a list of what you want and do not want and start narrowing it down.
My vote goes to a FZJ Land Cruiser... like this one -
http://www.ksl.com/auto/listing/14970741
Spend a little money on a OME suspension, run 33's, put some sliders on it and drive it anywhere and everywhere. They're slow, get 11 MPG but are incredibly overbuilt, reliable and capable, even one without factory lockers. If you decide you need lockers, toss an ARB in the rear down the road. I took my unlocked FJ80 on Hole in the Rock with 33's and had no problem, they are pretty impressive offroad.