The cameras you are interested in are not much different to what you already have, because the "engine" that powers them is not much different than the one in your Sony. By that I mean the digital imaging sensor is roughly the same size. So in essence, cameras like the SX40 and P500 are just jazzed-up point and shoot cameras.

I am not familiar with how the switching for the viewfinder and LCD is done on those particular cameras, but even if it requires pushing an extra button to review, it is not something to be confused about; it certainly would not be a problem.

Both the SX40 and P500 have been professionally reviewed and give good reviews. Other similar contenders are the Panasonic FZ150 and Sony HX100.