Just to give you a couple more options (and probably confuse you further!) I think there are 2 more bridge cameras worth your attention.
The
Fuji S200 EXR is built like an SLR (so it's bulkier than the Canons) and has a a 14.3x zoom and all the manual controls you would expect from a camera in this range. Costs around £300 and you currently get £50 cash back from Fuji when you buy one. My girlfriend has just got one and I'm very impressed with it all round.
The other one to look at is the
Panasonic FZ-38 which has an 18x zoom and should be around £270.
Along with the Canons, I think these are you best options. All of them are very good cameras which will give you everything from fully automatic point and shoot modes to complete manual control over everything.