What does canon's digital camera names mean: SX, SD, IS, etc. Is a higher number suffix

better? I am a beginner and am looking to spend around 300-400 on a new point and shoot digital camera, I will be photographing mostly friends and landscapes and such, normal stuff. I want to know what the naming system is and was wondering if any camera experts have any good experiences or could recommend a camera in this price range.
Thanks
 
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