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The S1 seems a bit too small for me. I played around with my friends SD400 and it feels and performs really good.
 
SD400 imo. Its the best point and shoot camera around. Most of the small cameras are not as good in teh quality department but my pics come out very good with the canon.
 
I have a Canon SD300, and the photos come out well. But I do love my Canon's, so maybe I'm a bit biased? I have never liked their regular Coolpix line, meaning the 4200, 5200, etc.... They were never comparable to my old Canon A60 (only 2MP), which is weird.
 
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