The Canon S5 has been a popular camera and takes very good photos.
It has grown into the SX30IS.

Buying a new camera is not going to get you a better picture, just more features

If you want something more professional, you should look at the Canon G12.
It has better low light performance than the S5.
However it only has 5X optical zoom.

You should think about going to a DSLR camera.
Much more professional than the S5 or the G12.
It has better low light performance than the G12 because it uses a much larger sensor assembly.

..