Make sure it has the full hard doors. They are an inexpensive option, but if you don't buy them when you buy the Jeep they cost a fortune
If it's mainly going to be just the two of you in it, I'd get the original. It looks a little sportier and the back seats are the same size, but the Unlimited has more space. The original Wrangler has a shorter wheelbase and is a little better suited for offroad - but both will do better than any other vehicle you can buy off the lot.
Buying your husband a Rubicon! What a woman! Do you have a sister???
(Just kidding - already happily Married :) )