First of all try to avoid selling now at all costs. The market in general is in the tank, and this is not the right time of year to sell anyway. Those of us who live in warm climates tend to forget that much of the country does not enjoy the luxury of driving a car for pleasure now. So attempting to sell now is asking for low/no offers.
As to your overall question about repainting it, I think it would be a mistake. A good paint job on a Corvette is expensive enough when you keep the color the same. Changing it to white will cost more than you think unless you compromise the quality of the paint job. Furthermore, it's resale will drop regardless of why you repainted it, in your case for a more personal choice in color.
That combined with white over saddle will probably limit it's resale value if you ever sell it. Then again it is your car so you can customize it in a way that makes you happy. However the money you would put into it will not be recouped, that much is certain.
Your best bet is to buy one with the color combination that you will enjoy for years to come. Needless to say now is the time to buy, not sell.
If you have the room and can afford to keep both until the market improves that would be great. Otherwise bide your time until things pick up.
