What zoom range do bridge cameras have then? An SLR with say the 18-135mm Nikon lens (or Canon equivalent) would be pretty versatile. Plus there is also the option for getting new lenses in the future should they take it more serious.
If not an SLR then I'd go for the G10.
The SX1 IS has a 28-560mm equivalent lens (20x optical zoom) and for me would be the bridge camera I would seriously consider.
I'd rather a Panny FZ38 if we're going for a bridge - it's a great lens, and has HD video with stereo audio