every liteon i have heard sounds like a lawn mower after a few months of it working. worse yet was a samsung.
going to go for a 760a plextor. at least it has some reviews of during dvd play its barely audible. someone breathing in this room is 2x as loud as my current computer setup, and its a gaming computer.... hard to find someone with my standard for silence. as far as operating in dvd burn or cd burn, I could care less how loud it is as I do that not too often compared. (silence is needed for movie watching and for doing my work)
I know the benq and 111D pioneer have the best ratings, but my pioneer which is much more expensive than a 111d failed in a year and half hardly being used :(. plays dvd's fine but sux on cd reading and it appears, cd burning.