Mines danger in the further sites

Ok, another temple nut here - again :)

Cresti you can definitely trust Andy B, he is THE authority on this matter here. I will just try to give some additional advice, based on what I know.

Prah Khan KS is another extraordinary site, but as I told you in another thread, perhaps the least astounding of these Big Six, and also the most dilapidated. Plus, it is also the most difficult to reach, especially in the rainy season, due to worse access roads there.
I'd say, decide when you are there, based on what the weather has been like. Remember that there might be a pause in the rainy season around that time, although the weather pattern this year has been quite irregular so I'd better not venture into forecasts:)

A good itinerary without PKKS would be: Siem Reap - bus/taxi to Kampong Thom - Sambo PK - Prasat Preah Vihear - Koh Ker - Beng Mealea - SR. This way you will also be more or less following a chronological order, from the most ancient to the Angkorian-era monuments. Forget about public transport along this loop. But if you do choose Sokhom - whom I also recommend - for a motorbike ride, you could probably release him at Domdaek where the road from BM joins NR6. He'll go back to Kampong Thom and you can easily find a taxi or pick-up from DD to Siem Reap. For PPKS, best bet is probably a dash from-and-back-to Beng Mealea, at least you could be able to make it to the monumental bridge along the ancient royal road.

From SR you can then work your way through Banteay Chhmar and on to Thailand. If you also visit Battambang, there are smaller temples around there as well, Prasat Banaan the nicest.

Sunsets at Angkor? You already have the best sites listed. Ta Keo is very tall but in the middle of a forest so not a great view from there. I would recommend Pre Rup for that, followed by Eastern Mebon. Both are serene temple-mountains, not many visitors there at sunset time, for sure (everyone will be at either P. Bakheng or Angkor Wat).

Hope you'll have a great time, give us a feedback afterwards if you can

SG

Andy, Striftsal, folks, your help is priceless, as usual. Thank you so much. I am really excited about this trip. It feels special.

One last question, guys.
How much is it appropriate to tip the guide in a trip like this?