I was just in the same position as you, trying to find my first camera and deciding a DSLR would be too much. While my budget was lower than yours, I decided on the Panasonic FZ35. I found one used for a great price and couldn't pass it up, and it has also gotten great reviews around the web.
You have some more to spend, so I would really recommend going to a few different stores and just checking out the cameras in your price range. A lot of the newer high- end superzooms are very similar, and a lot of it will boil down to your personal preference in the end. It's best to hold the camera, make sure it feels good and then play around with it a bit and make sure you groove with the camera well. If you don't have this option, you're stuck to website reviews and pictures. This is a good site, but you might also check out dcresource.com and imaging-resource.com for more reviews and comparison pictures. I also found youtube and flickr to be very helpful to see actual people using the cameras I was looking at and to see pictures taken with them.
As far as actual cameras, your aforementioned cameras were all very solid choices. You might also check out the new Fuji HS-10, and the Nikon P100. Good luck finding the right one for you! Peace!