If you get the Sahara, you can either have your dealer make the wheel/tire swap and give you some "credit" for the Sahara wheels/tires or readily obtain Rubi wheels/tires off of Craigslist and then resell your Sahara wheels/tires there as well. However, I'd just get aftermarket wheels/tires and then sell the stockers on Craigslist. Done.
If you get the Rubi, going to side steps from rock rails is a downgrade. Google "Ace Engineering" and spend $300 to get a top quality set of steel side steps you could mount over your rock rails so you have both function and protection. If you really must have the Mopar ones, you'll easily find somebody who'd trade with you. Hell, I will.
Just remember, you're getting a jeep--there's nothing you can't do aftermarket.