The Medeo T10+ would be the top of that list. The Diamondback is OK but a 400wh battery really, a little small for that price? Priority wouldn't really be on the list unless you find an actual brick and mortar shop that deals with Priority and can provide support for the motor. Maybe if the bike was 1k cheaper I would say maybe but still would want some motor support and I am unsure if Dapupu or whomever they are using is really going to support it, on their old bike when they used Bosch support was easy just about anywhere.

Keep in mind the difference between PEAK and NOMINAL power. A lot of cheaper motors and especially hub drives list the PEAK power to show off because that is what they think you want while most quality motor brands like Bosch list the NOMINAL power because their motors do the talking you ride it and you will be up that hill quite easily.

My Bosch Performance Line Speed motor gets me up hills easily and my bike is probably 70lbs at least with two batteries and a Rohloff set up. I really don't worry so much on that front. You will enjoy the Medeo and the Union has the right tire width but a smaller battery that I would want but over all looks similar to the Raleigh Redux and iZip Moda (and is actually probably that same bike truth be told knowing who owns them though they were using 500wh on those bikes)