The prosumer standard def DCR-VX2100 includes a 58mm lens filter diameter and a 1/3" 3CCD imaging chip array. This is where the low light capability quality typically comes from.

Similarly (close enough) equipped prosumer high definition camcorders would include:

HDR-FX7 (three 1/4" CMOS imaging chip array and 62mm lens filter diameter)
HDR-FX1000 (three 1/3" CMOS imaging chip array and 72mm lens filter diameter)

There are a few consumer-grade 58mm lens filter diameter cams - like the Canon HF S series and the Sony CX-500 series but they are flash memory AVCHD camcorders sporting a single CMOS lens... so their ow-light won't be as good as the 3-chip arrays.