Option #1 -
the NYC bezel is best bang for the buck. $125 but he buys and resells in batches. Have to wait for him to relist or find one m2m.
http://www.ebay.com/itm/New-High-Quality-Bezel-Vintage-Rolex-Daytona-6263-Watch-/262682215137?hash=item3d291482e1:g:tYMAAOSwU-pXuxzQ
Option #2 -
Highest Qualty is Phong / Jenson. They have MK 1, 2, 3, and 4 Rep bezels. List is $450
http://www.vintagewatchmaker.com/category-s/1819.htm