When I traded my JKU I was in the same boat, being that I was looking at making money on my trade I could have bought either vehicle (Rubi or Sport, Sahara is not something I care about) When I looked at the numbers and what I was paying for I came to the conclusion that the sport was better for my needs.
I knew I was going to replace the bumpers/suspension/tires and wheels and sliders, so all the things that come on a Rubi, less the front 44, gears and lockers andtransfer case, would be gone. I knew I wanted a good weekend crawler and yet something I could drive back and forth to work on base.
The only thing I wish I would have done is picked up and auto and not the 6 speed, but it is what it is.
I was able to sell all my stock parts except my springs, which I plan to make a table for my man cave with. In the end you really have to look at what you plan to change and what you want to do. Don't pay for things you plan to replace if you can help it, and if you're handy in the garage don't pay for dealer add-on's.