Thank you very much, that was a neat way to find all products, and quick specs.
ELPH 150 IS (IXUS 155) seems like a great choice - the only "problem" is that I do not know whatever going from PowerShot S100 to a newer, but "cheaper" camera , is a guarantee for lower quality pictures ?
I guess I need to try to be sure.
It's a pity 155 is not supported yet - how much work is it to compile for an average camera ? / and is that automagicaly done by the master developers once somebody provide a firmware dump ?