First of all: welcome!
Imola red is awsome!
It would be my pick of the two. They certainly do it for you. Imola red has been a standart option at the E38, and only a couple of months ago there was a preowned E65 760i in Imola red for sale in Germany. But more, an Imola red Alpina B7 has been spotted in Germany:
http://www.exoticsonroad.com/picture...ina-B7-Biturbo
To your questions. First of all if you have a date in mind when you would like to have your car, start early ordering. Ordering Individual does consume more time.
Ordering a BMW colour, but one which is not in the option list of the speciffic car will set you back a couple of grand, max 5k I THINK (donīt blame me for being wrong on this one).
You can do an individual order with any dealer, because you wonīt be needing them to specify your car. The information about the program has to come from a specialist anyway. I suggest you talk to DBS600 here on the board, he seems to have found the right person to help him order special request at BMW NA. Otherwise contact Mark Carsson at M5board.com, he has with very individual M6 on Hawai and certainly knows who to speak to.
Good luck.
Cheers,
Thijs