Thread wrap-up:
Picked up the SD200 at Beastbuy today, the difference in price for the higher models was too much for me. Also got a second battery and a 512 high speed memory card. Wanted a gig, they didn't have any in stock. The 512 looks to be enough for me for now.
Boy oh boy does this little camera ever kick ass. I love everything about it. The software has all the features I want and more. Including ISO control, something that was missing from my ixus300.
Lurve this little camera. Just lurve it.
Thanks for all the information and advice.