All camera models are different. Even if they are made by the same company, they will perform very differently from another. Also, just because it is an "upgrade" doesn't mean it actually perfoms better than the previous model.
Saying that, here is my recomm.
1. take a camera card into a camera shop and pop it in the your camera that you want. Take some pictures. Take the camera card and put it into your other choice camera and take the same pictures. Take them home and compare them. Make sure you take various pictures from close zooms to close ups, to low lights, colorful objects, mess around with the different effects............. See what you like more. Circuit City always lets me do this, as does best buy.
2. Go to
www.pricegrabber.com and plug in the name of the camera's. This will perform a search. Read the reviews and the professional reviews. Also check out
www.amazon.com for reviews.
If you are really serious and want to know the best one, this is what I do. Now you will have your canon lovers out there that will tell you canons are the best no matter what model it is, and the Nikon, sony, etc....lovers will tell you the same. I highly recommend you find out for your self.
Also, if you don't really care
that much, I would just see what one feels best for you.
Good Luck. Camera Shopping is my FAVORITE
... besides WDW of course.
PS. My favorite came is the Nikon D80 (DSLR) and the Nikon D40 (DSLR), my favorite P&S.......haven't really found one that I really like very much but there are a few sony's that I feel are OK. Including the Sony Cyber-shot DSC-H5. O, the Sony DSC-t30 isn't too bad also. I haven't messed around with the camera's you are taking about so I can't comment on those. I think those models are relativly new, and I never buy a newly marketed camera