Hello there! I see this is your third post. Welcome to the site!

I think the Canon and Panasonic camera you mentioned would both be good choices. They both compact and offer a lot of power and versatility in a small, relatively inexpensive package. I haven't used one of the Canon SX-Series cameras yet, but in my experience Canon has the best image quality of all the compact digital cameras. On the other hand, I am a huge fan of the features and performance of the Panasonic TZ-Series cameras. In particular, the new Panasonic Lumix ZS3 / TZ7 is a wonderful camera. The image quality is very good for a compact, it shoots excellent 720p video, it has a great 12x image-stabilized lens and the Intelligent Auto exposure mode works really, really well. I've been recommending that camera to lots of people over the past few months. Here's an article I wrote about the Panasonic ZS3 after the official intro event in January:

Panasonic Lumix ZS3 / TZ7 Intro

I haven't had a chance to use the new Casio yet, but I've asked them for one so we can review it. I wrote a short announcement article about it and it looks like a very solid competitor for the Canon SX200 and Panasonic TZ-Series. The Casio is also $100 cheaper than the Panasonic. I can't vouch for the performance or image quality of the Casio since I haven't had my hands on one. But it looks good on paper. Here's out Casio Exilim EX-H10 announcement page:

Casio Exilim EX-H10 Camera Intro

I hope that helps focus your shopping a little. Basically, I think any of those cameras is fine. If your current camera is more than a couple of years old, almost any current digital P&S is going to amaze you.