Really consider the Asus ones. I have an LG 20, a Plextor 18 (paid a fortune for it and really it's a Pioneer) and I have an Asus as well ( all SATA). The Asus is so quiet I usually have to look at the light to see if it's actually burning. It also, I found, does not spin up like made when I place a CD/DVD in initially or when the burning finishes.
+1 for Asus on these.
I find the Plextor is loud and so is the LG. However the Plextor keeps dropping connection all the time. Some times I boot up, it?s there? other times it?s not and I have to reboot twice to get it back. I tried replacing the SATA cable, changing SATA slot? nothing. The Asus just works all the time. Maybe I just got a bumn Plextor as I know they are known to be simply the best.