The problem is then things liek when you open the door -- the inside sill will be the old color. Same with opening the hood. It'll look weird.
You may want to get your car wrapped in a new color. That's easy to remove later, and protects it. The best place in town is Exotic Vehicle Wraps in Dulles:
http://www.exoticvehiclewraps.com/
They also have an in-house detailer who can look at a paint repair to get the scratches out. I'm pretty sure they wrap "normal" vehicles also.