If gas milage is a concern, the RR is not for you. If you want the most capable mid-sized truck that always puts a smile on your face, then buy one. I traded a Dark Horse in on my RR and like the truck better.
I had a mustang in CG and loved the color. You need to pick what you want, what is your gut feeling? Both colors are great but don't depend on a strangers' opinion. I got Marsh Gray and absolutely love the color and get many compliments, but it's not for everyone. The Sand will be rarer, and...
I like the look of the black steelies, but for me, sometimes less is more. Afterall, it's on an XL and if you think they look cheap, don't buy the cheapest model.
What do you want, a capable truck or a SUV? If you want fast, get a Mustang GT. I would expect the Raptor will hold its value better. Given the Raptor weighs more, the ST is likely faster.