Back when I started riding, I thought Sidi had a reputation for making crazily narrow shoes. Some time between then and now they started making their 'mega' width wide shoes and I think they may have overcompensated. When I first ordered a pair of Sidi shoes I assumed I would need the mega width, but when I got them I had to send them back because they were too wide. They make Mega width shoes in some of their nicer models, too, so you have some slection. THe other nice thing about their better shoes is that the 'treads' on the sole are replaceable so the shoes can potentially last longer than shoes from other manufacturers.

I have no experience with the other manufacturers of wide shoes, but they all seem to have a good reputation so are also worth a look.