Do you want to remain with tape or go tapeless
The sony FX-7 is a 1/4" three chip cmos cam for under $2k, the panasonic HMC-40 is a tapeless 1/4" three chip cmos cam also under $2K, for better low light perfomance you would have to go to a cam with 1/3" chips but you will be running in the $3k range
here is a link to read up on HDV cams
http://en.wikipedia.org/wiki/HDV