Not all garage doors and their components are the same. If you are trying to keep your spending in check, find a great value, not necessarily the cheapest option.
Be sure to ask your technician all that is included in the price quote. Ask if there will be any additional charges to get your new door up and running.
Get all warranties and guarantees in writing.
Installation is just as important as the product you choose. Be sure you hire a qualified technician to do your work.