1k is enough to do many things (you can live like a prince for 1 week)...I went both PP and SR in June and here's my iternary for 6 days:
1st day: Arrived in PP (late afternoon), dinner and wallkabout the town.
2nd day: Went to Killing fields, followed by Quad Bike tour around the villages and farms and also visit S21 and Grand Palace.
3rd day: Took a bus trip (Mekong Express) to SR. Went walk around the old market area and night market.
4th day: Angkor Wat 1 full day (abit chiong) Grand tour, small circuit and Banteay Srey. (Reached at 5am for sunrise shot and ended tour about 5pm, hired a driver US$25 for 1 full day in a Toyota Camry, additional $10 to go Banteay Srey as it is quite far from Angkor Wat.)
5th day: Went for full day floating village tour, an eye opener for me. Organised by non - profit organisation Osmose. (7am to 4pm) Night go dinner and walk around night market again.
6th day: Horse riding around villages and farms in the morning before leaving back to sg at 1pm.
I am not a 'temple guy', so Angkor Wat was impressive at first but soon I found many of the small indivdual temples are kinda similar. The part I enjoyed most is the visiting around the villages, farms. The most educational trip is the one by Osmose, as the guide explained the ecosystem, lifestyle of the villages and how do they make their living and overcome some of the challenges posed by nature.
I brought lots of stationary such as cheap pencils, pens, notebooks for them. This is one way to stop them from hogging around me trying to hard sell their items. Just for your information, the price for the items they sell is significantly cheaper than ones bought in markets. You will be surprised how some of these kids are fluent in different languages, including Chinese.
The floating village includes visiting the villages floating in the middle of the river by sampan boat. Wanted to include visit to bird santuary for birding but June is not the ideal time as the river water level is too low to reach there by boat.
Do visit tripadvisor for tips too. The floating village trip has a guide (no choice but good to have), Angkor Wat the driver can be a semi guide (at least mine can). The rest I see no need for any guide. I like Cambodia, generally I feel that the people are more friendly and honest compared to Thailand (my personal opinion). Taking tuk tuk at night, remember to say NO to "making new female friends" LOL
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Just to share, my setup is canon G1X (compact with zoom) for general shots, DSLR with fast prime (85f1.4, 135 f2) for portrait shots of the villagers, esp kids. I would love to go again on solo trip (my trip was accompanied by 3 'tai-tai' girls so I had little chance to really slow down and take photos.)
Just some sample shots:
http://www.clubsnap.com/forums/land-city-scapes-travel/1112605-cambodia-june-2012-a.html