This is a good source also

http://www.dpreview.com

I have a Canon S30,
Canon A80, S50 is good IMO

If you buy the S45 or S50 you can buy the extra li-ion batteries from ebay for $10.

but the video is kind of limited IMO

for buying http://bhphotovideo.com/ is good, there are online retailers around, but they sell gray market items, B&H is the Tower hobbies of photography.
Also you can find importedt items at B&H but they are clearly marked.