All the DV cams I have looked at closely have had both 12 & 16 bit sound, but I would never guarentee that they all have.
Standalone DV decks will set you back a couple of grand and IMO are a waiste of money unless it is your job and you can claw back the cost. Sony did do a deck a few years back for around £900, but that has
AFAIK been discontinued, but you may still be able to get the deck with a built in screen, but obviously this adds to the cost. Other than that I have seen a DV VCR from either Panasonic or JVC but that cost somewhere around £2k.
Mark.