Had a short vacation at Siem Reap, Cambodia last November 2015. I spent around $300 usd for the whole trip including the airfare and accomodations. Overall, it was a fun trip but I would suggest to consider making this a sidetrip when you're in Thailand since there's nothing really much to do after you visit the temples.
Places we visited: Floating Village, Floating Forest, Bantei Kdei, Bayon, Angkor Wat, Sister Srey Restaurant, Lucky Mall, War Museum , Killing Field
Airlines: Cebu Pacific
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Where we stayed: Central Hostel - http://www.booking.com/hotel/kh/mekon...
Cre: Ria Kathrine