Real estate financial advisor?

[Neal Larkins]

Does anyone know of a professional who I could hire to crunch the numbers on several different real estate scenarios?  The scenarios would include different states, different price points, and scenarios in which I lived in the home or did not live in it.  Therefore, the professional or team should be understand taxes, personal finance, and the real estate market in different areas.  Does such a consultant exist?  Thanks for any suggestions!

As background, due to my career, I regularly go overseas for a few years before coming back to the DC region for a few years.  I have been trying to figure out whether to buy a home in the expensive DC area to live in when I'm there and rent out while I'm away, or to do pure real estate investing in a cheaper market.