Unfortunately white is not available on the iS. Preferred color is the one you like. Ex; Some people would love imola red, but others would fear tickets. Only options on iS are nav, rear door airbags, sliding load floor, running boards, trailer hitch, and (I think) heated steering wheel. Nav isn't the greatest, but looks better than MID display to me. If you would ever need to tow, try to find one with hitch as it is about $1000 to get one put on @dealer and supply has been off/on. Try your best to get one with bmw extended warranty as long as you are not paying too large a premium to do so.
Good luck, I love mine.

Scott