Answer Best answer as chosen by user singerrach
Nothing much better
Image and video quality in low light is tough. With moving subjects, it is even tougher. Plus you want to do it on a tiny budget? No chance. Quality comes from a bigger sensor and a brighter lens. Those things cost money. That said, you will do much better if you stick to video alone...the moving images of video and the low resolution of HD video compared to still photography would allow you to take reasonably good video with a cheap camera. For still photos, you would need to adjust the camera's ISO control way up, possibly as high as it will go. You may get acceptable images as long as you don't expect crystal clarity in full resolution.
Canon has an upgrade program where you can trade in your old camera for a better factory refurbished one at I believe 15% less than their normal refurbished price. So you could get a Canon SX260 HS for about $180; roughly $50 less than a new one. The number to call (for USA customers only) is 866-443-8002.
The other responder mentioned a superzoom. The problem with those is that they will have more zoom, but no better image quality, and the superzoom looks too much like a DSLR camera; security at some venues may not let you in with such a camera, even if it is not a real DSLR.
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