roamer

I'm going to take the plunge with an '06 TL. Originally it was going to be a TSX but amazingly the TL leases for almost the same payments here in Ontario Canada so why not get the better car. Two questions before I make the move.
I like the WDP colour but how is to take care of in comparison to the Silver. I have to leave the car outdoors much of the time. Which colour will resist waterspotting
and swirl marks better?
Also has anyone switched tires as part of the purchase deal. Here the 6sp only comes with the Potenzas and I hate those tires. They sucked big time on another car I had. Would the dealer switch them even up with Michelin Pilot Sports if I insisted?