I'm gonna buy another DVD burner, as my Sony DRU-510 seems to have gone on permanent vacation.
I'm leery of the Sony DRU-810, because of what has become of my (very lightly-used) DRU-510.
I don't want to spend the money on the Plextor 716A, because Blu-ray and other changes are just around the corner.
I'm leaning towards the NEC-3550.
Dirt cheap, efficient, reasonably fast, and bullet-proof.