I don't think I'd be fussed about different colours - I think it's kinda iconic in white and helps it stand out against the competition - certainly not enough to be interested in buying another system but, as someone else said, its a good business strategy to boost sales. I've seen a lot of 'skins' for the Wii and remotes so I'd probably think of shelling out pennies for them before buying a whole new Wii. Colours? Blacks a must. Blue would be cool, green even better. Silver, maybe.
As for the whole VC issue i think thats a real shadow over Nintendo. Its unfair. You buy a new iPod and all your old iTunes purchases go on it!! It's a shame that a great company like Nintendo can be so stingy....