I've been sweating this decision for weeks now, and happily watching prices go down at the same time. From reviewing a lot of posts on a lot of forums people seem to be most in love with the pioneer models.
nec1300, sony510 and plextor708 or 504a seem to be next and in about that order in people's hearts, but really pretty close to tied.
optorite has the HD burn thing going for it and of course everybody always swears by liteon, but there seems to be less fervency about the liteon dvd burner.
my decision: still thinking about it....
edit:typos