My favorite by far after buying 3 different pairs of boots the last 4 years is the Sidi Adventure Goretex. Great in all temps, 110 to 20 degrees, and completely waterproof. Very comfortable on the road, and great off road. I think the boots saved me from a serious ankle injury riding in the Utah desert this fall.
X2 as well. The Sidi Adventure boot are my new favorite piece of gear. They have all angles covered regarding protecting your feet and ankles. I had the pleasure of being run off the road at 55mph in August of this past year while wearing a pair of Doc Martins. Lisfranc fractures in both feet, broken left lower fibula, malleolus fractures, broken talas, several broken tarsals on both feet, complete tears of the big 3 major ligaments, broken hands, and a broken C7. The boots won't help the neck, but if I had even a marginal adventure type boot, I would be in considerably better condition now. Permanent damage to both feet and ankles is no way to go through life son.
On a positive note, I have recovered about as much as I can. I had my C6 and C7 fused a few days after the accident, and that has gone well. I even snowboarded some blues for a week over Christmas break. Painful, but the kids had fun.
Not to ramble....My point is, you have absolutely no control what your body will do when you dump your bike. You can think, "Pull your arms in, don't put your hands or feet down, etc", but the forces at work are extreme. A good pair of boots with some real protection is worth every penny you pay. Solid, cupped heal, shanks, reinforced toe box, and stiff enough to prevent twisting, but comfortable enough to shift and walk around in.
Sorry this was so long.