There's no better resource for refferals than the one you are on right now. The nice thing about using trulia is that agents that frequently use the "Q & A" section very clearly display their knowledge, values, and moral fiber which far exceeds any other resource.
Do not call an agent who is not easy to reach. (not contact data)
Do not call an agent who does not display their telephone number.
To support what George stated. I do not, and apparently others do not, respond to inquires originating from the 'contact' link or through Trulia email. Pick up the phone and call. This action will reveal the level of service your referral will receive.
If you are serious...call
Why is that so difficult?