Guide in Angkor Wat

Hi,

about to set for Cambodia and Vietnam, starting with temples of
Angkor.
I did some reading but I still think I would appreciate a GOOD guide,
someone who knows history, religion, can read the reliefs and
understand the symbolism etc
can anyone tell me how to find such a guide or recommend someone???
I would like to hire the guide (cost?) + car (20USD/day?) for 3 days
we planned for Angkor.
many thanks

J.

ps. and while we speak, any decent not too expensive hotels (don't
want to waste time looking around really)? Thanks!!!