The S90 and G11 are so close in terms of price and specifications that the S90 might be worth considering as a
replacement of the G11 (if the latter's additional features are not essental), but as an
accompaniment for quick shots something even more pocketable probably makes more sense.
then the SD1200 (which has an OVF).
Yes, the SD1200 (Ixus 95) might fit the bill. Same resolution as the G11, but a smaller sensor. If you can still find one, the SD770 (Ixus 85) has virtually the same specs, but a thinner, better-looking body and longer battery life. The SD940 (Ixus 120) might be interesting for its 28mm wide angle, but it's probably noisier and has no optical viewfinder.