After a series of disappointing/bland meals in the Old Market area I finally made it to Cuisine Wat Damnak on my last night of my trip. Although very pricey by Cambodian standards I thought the tasting menu at US$26 was a steal. Wonderful & delicate Asian/fusion flavours with contemporary presentation and a well thought out progression of courses.
Make sure you book ahead! We tried to get in for 3 nights running and they were fully booked.