I can see Red Bull having a number 83 in there somewhere. Something to do with the can size, which was why their NASCAR team used it.
I can definitely imagine Alonso picking 27 - not just the traditional Ferrari link, but Senna won one of his titles with that number - and Hamilton 44, which was a favourite of his in karting (I think he also had some success with 25). Indeed, we could see a few old karting numbers revived; it was probably the last time most of the current grid got to keep a number for any length of time. And Kimi may well pick 69, just for the hell of it... ;)
Of course, the irony of all this is that even picking your own number, you won't beat the current records for smallest and largest winning car numbers - 0 (any of Damon Hill's first nine wins) or 101 (Alberto Ascari, 1952 German Grand Prix, which was entirely contested by cars with three-figure numbers!).
Just as long as we don't go down the NASCAR route of allowing two-figure numbers with a leading zero...
