Just about every manufacturer makes a super zoom camera, with anywhere from an 18x to 36x zoom lens, and that is optical zoom alone. None of them however, will use any bigger a sensor than your current camera. Because of that limitation, and because of the limitations of the lens (not the focal length, but the amount of light they can let in via their aperture), they do not work well indoors on subjects that are moving. Another limitation is the method by which small cameras acquire focus; they work well in good light, but indoors they are slower. Outdoors these cameras will (usually) give good results. Probably the current best of the breed is the Canon SX30 IS.

If you want a camera that works better in low light, you would need to make a sacrifice in size, zoom range, and/or price.