Maybe just stick to an 04-06 Unlimited. Only two doors, smaller than the JK, but still larger than a regular TJ. And you could still get the 4.0 instead of the minivan motor:jump:
That "minivan" motor, is more than an acceptable motor in the JK. Its got plenty of power, especially if you do a gear job from the Rubicon 4.10's to 5.13's, then you're really good to go.
I have driven every Jeep out there is testing runs, and as far as "Jeeps" go, the JK is the superior choice, and most notably the RUBICON Unlimited, when it comes to expedition types of uses.
The motor is slightly smaller, but it loses nothing as far as heart goes, the frame is stronger and lighter than any other Wrangler predecessor (as reported by Jeep themselves) and the out of the box capability of the Rubicon models is far superior with the e-lockers and e-swaybar disco (fantastic idea, and works amazingly)
Its a fantastically designed vehicle and will serve well in an Expedition and offhighway travel capacity in stock form. Modifications will only enhance that.
I find there is alot more driver room in the JK models than the TJ and especially YJ. I always felt really squished in and cramped in the TJ model, even more so in the YJ models (no elbow room, and my knees always hit the dashboard). In the JK I have tons of room for my legs and elbows.....I'm a 6'4" 250 LB guy.
Anyway, your choice is personal. :elkgrin: