Originally Posted by Kylerk

As someone who also wears a size 14 I have found Sidi to be the best for large size quality shoes (they go up to size 52 in some styles), but as others have mentioned - Northwave, Lake, etc. also go big.

I found this link previously in these forums that may be of help:
http://www2.bsn.de/Cycling/shoe-sizing.html

You may also want to do some searching in the Clydesdales/Athenas forum.