Your posts reinforce my recent decision. I had bought a Nikon D50 a month ago. I've been using an SD200 (my 3rd Elph) and getting some nice pics for the size, so decided I wanted to get more serious. My daughter took the Elph and I started hauling around the D50, experimenting with settings, exploring RAW converters, pricing lenses. It didn't take long to realize I wasn't having as much fun. On a kayak trip, I kept having to haul the thing out of the dry bag and go through all the gyrations only to get home and discover I had to post process everything to get nice pictures. So, I sold it last week and, based on my scouring this forum, chose the SD500 over the 550, 600, 630, and 700IS (and got it for $256 at Buydig). For my active lifestyle, nothing beats having a decent camera in my pocket!
mike