I'm not sure what it will cost in S.A. but the Canon S90 sounds awesome. If you're not in too much of a hurry, I'll be able to give some hands-on feedback in about three weeks. I'm picking up one for a friend here in the US - going back in three weeks.
Personally, I'm very happy with my G9 - it's not super slim, but I can fit it in my jean pocket, and produces really good pictures. From what I've seen the current version, the G11 is even better.