Her in Singapore, The FZ-20 was only introduced in April and it costs SGD$1099 at the megashops, translated to USD $678.00.
I do not know about the US/Europe markets, but if I were you, I would go for either one. It only depends on what you want out of the camera.
Personally, I am in your shoes, as I am also looking at both. In Singapore, we will be having our PC show on the 2nd of June and I hope to see the canon S2IS before I make my decision.