MED all the way with Burton boots if they are a new model ( less than 2 years old).
Another boot brand, who knows, you should ry them out. MED still work up to size 11.
This is good advice. I wear size 11 Burton Grails and they fit great in medium bindings, Cartels, Missions and CO2. I also have some large Cartels and find that they are too big with my boots, it's always best to try the bindings with your boots if possible.