If your not going to do any hard wheeling, or steep hill climbs, I would go with an X/Sahara/Sport. The Dana 35 will hold up decent if you are keeping it stock and just putting around with it. If you plan on a lift and some mud tires, I would go with one with a Dana 44.
The Rubicons have 4.10/4.11 gears, not 3.73s. They also get a good bit less mpg wise driving around because of the heavy MT/R tires, and the gear ratios. Most people who buy Jeeps don't care about that, but lets face it. Gas is 3.40 a gallon and rising
Anyway, Rubicons still pull a premium and if you don't need it and aren't going to use it, I would save yourself some cash and get an X/Sahara/Sport. Like I said above, if you plan on muddin a little, just look underneith the back. A rubber drain plug on the rear diff is bad. A square metal plug is good
I also agree with the above. Go for the I6 if you can.