as a realtor myself I can tell you what you want.
You want someone with their ABR Certification, Accredited Buyer Representative
http://www.rebac.net/Content.aspx?PageName=abr.htm
You can go to Realtor.com and look up agents by Certifications in your local market. Trust me, it makes all the difference in the world between getting a professional and a brand new licensee who got you while doing floor time waiting for a inbound call to the desk.