Another vote for the Shen Hao.
I adapted a Chamonix universal bellows and found that it works with even my 65mm.
However, while the Shen Hao is much easier to pack than a Sinar, it's only a pound or so less in weight.
Most of the weight of your kit will be lenses, film, and other "necessities". So it comes down to which is the more important factor, weight or bulk.
I also agree that the Toyo CF would be a non-starter for your needs. It's just too limited. You might read my article comparing the CF and Shen Hao. It's on the Toyo (Mamiya America) web site or can be found on the Shutterbug web site.
JD
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