Go to your local MX apparel shop and try some different boots on. Remember that if the boot has an inner bootie, you will need to go a bit bigger on size than you are used to. I have size 13 Boots! They fit like a glove though and are not goofy big looking. I have Tech10's, they are great boots. I was a little worried about how long they would take to break in since they were very stiff, but they only took a few good sweaty rides and they formed up nice. Tough to walk in but when you are in the riding postition, you don't even know you have boots on! The latches are great, although they still will break on the plastic extending strips like the rest. My only concern after having them for awhile is the wear on the soles from the footpegs. They are replaceable, but the bottoms seam a bit softer than the tech8's more leathery material. The Tech10's are definately a hybrid between their street boots, which I think makes the bottoms too soft for thick spiked pegs and the more active footing of off road riding.
You still can't beat Tech8's......
Sly