If you're not in a hurry, and if you play to upgrade to DVDA3 when it comes out, you might want to wait. Burner support may improve with that release, so your field of options will be larger.
Thanks for the note. I was in a hurry to get a new burner for my laptop since it only has a 1x unit. Now I have a new desktop with a BenQ 16x burner that works great with DVDA. So I guess I will wait until the next version comes out before springing for the external burner.