Quality of sound is the main thing. To get that, you need high quality condenser mics, excellent analog/digital converters, and the ability to record at higher than normal cd resolution. 24 bit at 96 mhz would be best for a home recording outfit. Then the unit or an outboard box must have a good dithering algorithm to get you back to 16/44 resolution so it will play on a normal cd player. Stay away from lower priced units if you plan to produce a commercial cd. The cheapies are only good for demos.

Al