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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.
 
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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