Well, like all the other replies to all other boot threads, I'll give you the scoop. Don't buy online without ever trying the boot on. Sure some websites have a sweet return policy, but it's a pain in the ass to have to keep returning boots that don't fit right.
If you are feeling nice, go to your local shop or outlet, and just start trying on boots. Make sure the boots fit snug on your feet and walk around in them for a while to make sure there aren't any serious pressure points. Buy what is the most comfortable.
If you are feeling like a dick and want to save money, do the above, and then tell the shop you are figuring out the sizing because it's going to be your christmas present. Then proceed to buy the boots online for cheaper,(if they are cheaper, right now 10/11 stuff will probably be a flat price between sources).
PowderHound and TreeNinja