There is little first hand information about the Casio Z60 and Z600.
I did find some sample photos for the Z600 and to me they looked soft, about the same as the Canon SD450.
I could not find any sample photos for the Z60.
I would wait for some reviews to show up before deciding.
While you are waiting, take a look at the Olympus Stylus 710. The lens on the 710 is sharp.
I'm a casual photographer and I'm looking for a new camera. These are my choices so far:
1)Canon Powershot SD450
2)Casio Exilim EX-Z60
3)Casio Exilim EX-Z600
Can anyone give me some opinions on which of the 3 I should go for?