Kozys' is currently having some nice deals on Sidi (regular widths as well as megas). Here are the megas:

http://kozy.com/product/10-sidi-2010...mega-10744.htm
http://kozy.com/product/09-sidi-geni...ga-40825-1.htm - closeout '09, size 40 only.
http://kozy.com/product/10-sidi-2010...mega-10746.htm

I have a pair of Genius 5 Pros currently on a UPS truck somewhere between Chicago and NJ. I normally wear a size 14 (size 49 Sidi), but I want to start riding with my orthotics (that run the full length of my feet) so I ordered a pair of size 50 megas - and I'm pretty confident that this configuration will work for me.