Thanks,
I am leaning towards 16mm as the film prices and processing seem to be comparable to S8 anyway and 16mm offers better resolution.
the K3 looks like a good bet, and I am also looking at these:
Eumig C16
http://r.ebay.com/pBWnAX
Beaulieu 2008
http://r.ebay.com/8Opr6Z
Bauer C 107 XL (8mm, but I am told that 'XL' in camera model numbers indicate low light capabilities. Is this correct?) http://r.ebay.com/FxW4iE
Bolex (I like the side mounted viewfinder)
http://r.ebay.com/36iOuo