Beware of the adhesive labels you throw unto DVD and CDs. They are not good for their respective players, because they add a lot of weight to the disc and can become off-balanced. A better solution is to get a printer that can print on a inkjet printable disc. Well designed inkjet printable discs can look very sharp, and more importantly, they shouldn't destroy anyone's DVD player.
There are also automated disc duplicators that have built in disc printers from Discmakers and Primera. These are much pricier than a standard printer. But, if you plan on doing lots of multiple duplication runs, these might be a good fit.
Good luck finding one, I'm sure there's some folks on the forums who can reply and give you specific feedback regarding a specific model they use.