I'm in the process of buying my wife a compact digital for her birthday. I've narrowed it down to the Canon Powershot SD870 IS vs the SD800 IS. The size of LCD screen and small increase in megapixels of the 870 don't concern me a whole lot. The biggest difference for my decision is that the 870 does not have an optical view finder while the 800 does. That seems to be the ONLY knock I can find on the DS870. So what would the verdict be as far as how important you all think the optical viewfinder feature is?