Good Luck in your search, keep in touch and let me know how you make out,
1: A good agent will put in many hours into a transaction and to do all that work with a chance of you buying in another state with another agent doesn't create a whole lot of loyalty from that agent.
2: Working with the same agent will help not having to cover the same ground twice the more you work wih an agent the better feel they get for what you want.
With that said...working with two agents really depends on the contractual relationship you have with that office. In most cases it shouldn't be a problem.... Good luck.