I've been really happy with Samsung optical drives in general. Not the absolute cheapest, but they tend to be relatively inexpensive, but high-quality stuff. If you really have $$ to blow, you might look at a Plextor drive, but these will be pretty pricey.
LG are ok but they can be loud. That just might be mine though. I've also had Toshiba drives and they're ok, but LG would be my bet.
I'd go for NEC ND3500 16x DVD±RW Dual Layer ReWriter or Pioneer DVR-108 16x DVD±RW Dual Layer ReWriter