The best color to me is blue.
He has a 3DS, not a DSi. And we're not sure about the colour of the 3DS.
Besides the color of their outer casing, nothing is different. Choose the color of 3DS based on whichever color you like best.
Red
On the 3ds shop, you are able to buy and download older games. That work for the buttons on the 3ds of course.
As of now, no. The colors available when the 3DS launches will be Aqua Blue and Cosmo Black.
Blue and red
i think it will come out in 2012
yes
Unfortunately no. However it may become a new feature in a future system update.
2012blue,black,red,a new color purple
Although red Nintendo 3DSs were shown in some of the pictures at E3 2010, Nintendo hasn't announced the color red for the 3DS. Currently, there are two colors, Cosmo Black and Aqua Blue.