PLEXTOR of course...just kidding:p
I have the same doubt as you do, but
i decided that when i have the money iÂ´ll
buy the cheapest n right now, the NEC writer is the one.
Another thing, if you plan to burn or rip cds
with it, go for the Liteon.
Hope i could help.
oh, i forgot, the new firmwares from Liteon
have support for Booktype setting (bitsetting), n that may come in handy.