I wear a 15 also. You know what they say about guys with big feet.......
Good luck buying boots.
Anyway, i just bought a pair of the Alpinestars SMX-4 in a Euro 50, and they are actually just a tad big. I will have to wear thicker socks. My feet are also relatively wide and these fit great regarding width. Now it just needs to break the 39 degree barrier here in Ft. Wayne. So far, all I have done with them is sit on the bike and make motorcycle noises in the garage.
I think retail is like 200 bucks too, so theey are a pretty good deal.