Colour is a personal choice. a mate of mine had a white one and had no trouble sellng it. White in my opinion is one of the least liked colours.
Mileage dont mean didley on them. When I bought mine i looked at loads of low milers around the 30K mark and some were smokey and rattley bags of shit. Service history is far more inportant. The one I bought had 79K on it with full history and was a much better buy. I think the big turbo modles seem to be the ones most peeps want and seem to be easyer to sell thats only what ive read. Standard or modified, Only buy a modded one if carreid out by a reptable cossie workshop.
They are excelent cars, had mine six years now and still love it.
Dave