Comps & CMA service --Recommendations?

[Jose Enage]

I just wanted to get a feel for what everyone uses. Do you have your own realtor? Or do you use one of the comp services like www.compthathouse.com or www.investorcompsonline.com?
If you used one of them, which one would you recommend?

For a wholesaler, I need to be able to make multiple quick analysis and thought a service rather than a realtor might be a better option. I learned not to use Zillow or Trulia for final analysis asthma are said to be unreliable.

Your comments please.