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JM - the trip was great - but somewhat physically demanding as result of the altitude. Don't underestimate the affect of altitude sickenss on us lowlanders.
The trip was booked through Intrepid Travel (via an adventure travel agent in Ottawa), who then hooked up with Royal Mountain Tours in Nepal.
Flew to Kathmandu, Nepal. Spent a few days there, then started with the tour (fabulous Nepalese tour guide and 14 travellers). Flew to Lhasa, Tibet via Air China (and saw Everest sticking up through the late monsoon clouds). Spent 5 days in Lhasa getting used to the altitude and seeing the various sites (Chokang Monastery, Potala Palace, Drepung Monastery, Sera Monastery, Ganden Monastery, and the Norbalinka (summer palace) (and apologies for any spelling errors). Then boarded 4 Toyota Landcruisers (4x4) for the overland trip to Gyantse (fort and Kumbum), Shigatse (A monastery and the Tashilhunpo Palace), Sakya, and on to Everest Base camp (5200m). Stayed in tents hosted by locals at Everest; had a beautiful evening, night and morning with lots of pictures. Quite an awe inspiring site. The 3 hour trek into base camp and back out again to the Friendship Highway (using the term Highway loosely here) was very much overland, and rough, and at times exhilirating. Thank god for good vehicles and superb drivers.
Then drove through to Zhangmu (through a very deep gorge at night - had to travel at night due to road construction. Road was equally rough as the Yak track to Everest). Crossed the friendship bridge back into Nepal on foot, and boarded a bus back to Khatmandu.
Took over 1000 pictures, and had a fabulous time. Altitude sickness took its toll on the Mrs and me, despite using Diamox (prescription drugs for altitude).
The Trip is called Tibet Unplugged and can be found on the Intrepid Website (www dot dot intrepidtravel dot dot com).
We went the Tibet route to base camp as the couple we travelled with, she is a school teacher, so the trip had to be in July and August. This is the monsoon season, so the Nepalese side was out of the question. In fact, one day in Kathmandu, we hiked out into the valley some 20 k, to a vantage point for seeing Everest, and all was cloud and fog.
As to cost - pretty reasonable all things considered. There was the cost of the trip through Intrepid, air fare (10 years worth of accumulating aeroplan points

), and then about another $2300 US per couple (that included sights, all meals, souvenirs, gifts, etc, and the odd bottle of Johnnie "Worker" Scotch - the Chinese rip off of the real stuff.)