If your hives are any distance from the hedge, there will need to be quite some height to the hedge to provide the windbreak. Is this windbreak mainly for winter or all year? I vote for a variety of things to include flowering/fruiting bushes and trees mixed in with arborvitae and blue spruce. What would be the length of the hedge? How many acre apiary?
Check out Raintree Nursery for bareroot available in the spring. I have ordered many things from them three years in a row and was happy with what I got.They may be somewhat sold out on some of their stuff this year, but there is always next year. Keep in mind that bareroot would be sent in a dormant state.