He wants something a little more 'racey' than his Specialized BMX, so I was thinking of something along the lines of an older Allez. I imagine a 50cm would probably be most ideal... probably a little big for him right now, but I figure he should grow into it rather quickly and I may even get a solid 2 years before he outgrows it and needs a new one.

Basic requirements:
Bosses for down tube shifters and eyelets for a rear rack.

I'll probably start him out with just a single speed, but would like to add multiple gears later as he rides more miles with me.