Hey Matt -
We live in the the Los Angeles area, in "the valley", where it can be very sunny for the entire year, and get pretty hot during the summer, so that was one reason we didn't go with the black leather, we thought the tan would be cooler (although the auto start feature does cool down the car VERY quickly). We also have two little ones and the tan interior stays much cleaner. I have and Audi with black leather interior and although I think it looks really cool when its clean, you do see every speck, crumb, and piece of dirt that's either on the seat or on on the floor of the car. We also thought the tan interior looked better with the "wood" trim.
I think this color looks great all the time. Its my wife's car and when I leave for work I'll see it in the driveway and always think "Wow, what a great looking car" Then she'll get it washed during the day and when I get home i think "Holy S**t! What an amazing looking car!!!" So to answer your question, I think the color looks great all the time, but for the few days after it's washed it looks especially great.
And yes, everything is stock right now, including the window tinting.
Whatever color you decide to go with you won't be sorry, this a great car to own.