In all honesty, I haven't gotten as far as picking out specific models; I'm trying to see if anyone has an opinion on specific models that have a good reputation for clean burns and reliability, 'tho forum trawling isn't working so well so I thought I'd throw the question in direct.
It's tricky; I went for Plextor because they had a reputation for building really solid drives - The fact that they cost twice as much as eveybody elses would make you think they'd use decent parts.
As it turns out, the 716 was constructed incredibly cheaply (From the photos posted in the Plextor forums, my old Mitsumi CD burner looked more solid!), and I'm a once-bitten twice-shy kinda person, and don't really want to risk so much money on their newer drives, espescially since they are very Linux-hostile (They encrypted the special commands so that Alex's pxscan can't use them anymore, and apparently you can't even use BitSetting with things like Nero in Windows with the original firmwares!)
<Yeah I'm slightly bitter :p>
I've been looking at makes like NEC, LG and Pioneer at the moment, but I've been reading good things about the BenQs too...