Sheesh, it's a Panasonic FZ20, not 22. And it's a Leica lens, not bloody Carl Zeiss!
And I think we can say the 300D is in a completely different price league!
I've got a FZ20 and am very happy with it - a wonderfully fast lens:
http://pbase.com/wangi
I'd recommend asking this question on a more appropriate site, and spelling out exactly what you want out of the camera, what you're going to use it for:
http://www.dpreview.com/forums/
http://forums.dpreview.com/forums/forum.asp?forum=1033