Buy a really good fitting boot from a goot bootfitter. They are worth it.
Not only will a good fitting boot feel better it will make you a better skier. Get some full custom footbeds. It will be worth the extra money.
Any 12 din good binding will do well ( rossi axial 12/look px 12, Salomon sth 12 driver, marker griffion.) The only time when boot size comes in to play is AT bindings as they come in certin sizes.