Investor friendly brokerage in Virginia

[Brian C.]

My wife is currently working on getting her real estate license with the primary intention of aiding our own real estate investment activities.  Outside of our own purchases, we would only be potentially representing friends or family.  

We're looking for a brokerage that would be friendly to this and most cost effective.  In addition to any specific brokerages in the area (Stafford, Va and surrounding counties), any advice on terms of working with a brokerage?  I would imagine base case is a commission only arrangement, if possible.

Thanks for any input.