Check out the following:

http://www.managemyproperty.com
http://www.allpropertymanagement.com

We recently launched a website to help property owners like you in their search for a property manager. See the link below. I second the suggestion about interviewing multiple managers.

If you'd like advice on what to look for in a residential property manager, you might find some of the articles in this guide helpful: http://www.managemyproperty.com/knowledgebase/hiring-a-prope…

That is out of my area, however I do recommend that you interview at least three, check their references. A good property management company is of great value, size is not as important as the people doing the work.