Dave, all I can tell you is the link that I used was no longer active. It is clear to me from the two that you posted that the itinerary is similar. Regarding, the possible Friday closing, we'll have to see what Regent comes up with.
Marcie, I don't know anything about what Regent might offer for Angkor Wat. We went in 2007 after PANDA and spent four nights there. (We had planned on three, but rather than going into Bangkok, we decided to stay in Siem Reap an extra night.) It was fascinating. It was also easy and fairly reasonable to book round-trip air on Bangkok airways to Siem Reap. Nice jets.
I arranged everything independently. We stayed at the Hotel de la Paix, which I had found in a New York Times article. It has one of the best spas in SE Asia, so even if you have no interest in the hotel, if you like spa treatments it is well worth knowing about-- and compared with ships or U.S. prices, treatments are a steal, which you would expect being familiar with spas in that part of the world.
The hotel and rooms were terrific, and I have sent other people there who enjoyed it. The hotel offers packages with room, some meals, and a guide and driver to the major sights. I think that I posted photos at the time and could probably find some to forward if you are interested.
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Eugene