I'd support two of these...
www.dvcresalemarket.com and
fidelityrealestate.com . Personally, I think that it's more likely that you'll have a good experience with resale if that is the ONLY thing the broker does. I think there are other business models used by companies that also offer rental (as they might be buying contracts on the cheap and stripping points) or offer title services (as that is a complete conflict of interest).
As important in the process is the title company. I've been happy with Mason. And have found First American to be a total disaster, where people there often don't even respond to emails.
Lastly, most of these businesses (resale and title) are reasonably low-pay, low-volume jobs. No employees there are getting rich. So it's best to review everything carefully and have a little patience.