Senora_Jefe and I just returned from Angkor and while Ponheary was unavailable, she put us in touch with Mr. Than Sopheap, who was our guide for 2 days. He was great, and I would recommend him to others. He can be reached through Ponheary, whose contact information is elsewhere. He is very soft spoken, so if you are a little hard of hearing, he might not be perfect for you, but that's my only comment.

Once you have a good guide, it is pretty easy to tell the difference between one who is truly a guide, and one who is a guide because their brother is the local police chief.