I do not think you are ready to ED based on where you are in this process and being undecided - so you need to know more about several options with each college. If in the small chance you get in ED that is it. It may be better for you to have a few to consider in the Spring as you research various majors and opportunities at the different schools.
EA options may be better for you. This page has a helpful list. Early Action and Early Decision Deadlines - Compass Education Group