change something...

"Good low light" typically means LARGE lenses (60mm or larger lens filter diameter) and LARGE imaging chips - preferably, a 3CCD or 3CMOS imaging chip system that is 1/3" or larger.

The starting point is the Sony HDR-FX7.

"Good sound" is more than the ability to add an external mic. It means having manual audio control. I *think* the least expensive that have this are the Sony HDR-HC9, HDR-CX550, Canon HV40, HF M series and HDF S series. The lenses are relatively small - the Canon HF S and Sony HDR-CX550 are around 58mm, while the HC9 and HV40 are in the 37mm filter diameter range. The HDR-FX7 also has manual audio control and an audio input jack.

So... can you please define what a "kinda low" budget is? Less than or more than $1,000?

We also don't know what you will be doing with the video after being captured, and we have no idea if editing is in your plans - if so, we need to know computer details...