Quote: Would it really kill the selling price later on by going to a black interior?
I don't think changing interior color or any other bolt on changes will affect a cars value a significant amount unless you toss the original (and in some cases hard to find) parts. Go ahead and add whatever bolt on items you like, keep all the original stuff and you'll be fine.
Changing a cars paint color is a MUCH bigger deal, a PROPER color change basically requires that the car be stripped of every nut and bolt until it's a bare metal shell before repainting the new color (and the same if it's reversed). The other considertion is the labor involved in stripping and replacing all of the parts during the process. A color change iss not just the cost of a fresh paint job, but allot of additional assosiated labor expenses as well.
