The more you are going to use the bike over different terrain, the more likely I would go for the extra gears. The more likely you are going to carry stuff on the bike, the more likely I would go with the extra gears.

You can put roller blade wheels on the bike yourself. Very easy mod. Unless it has changed, I did not need the rear rack for the roller blade wheels.

I thought that the rear rack was not worth its weight relative to the front mount for the giant Brompton bags.

If you really want the different color, I would wait for precisely what you want.