For sizing you should just take your boots in when you buy your bindings. Any good store should let you check the size of the binding on your boot before buying em.
I forgot about the new highbacks, I did ask a friend who has them and he said they're a lot more comfy (but he doesn't like forward lean). Honestly, I think both are decent bindings, I'd lean towards the 390s though as I've had problems with the Burton latches before (although it's a simple fix that many shops will replace for free).
I teach snowboarding via step-by-step videos lessons at
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