The Shadow said:
Just a slight warning.
The NEC drives really are the best overall writers but they're terrible readers. When I first got my 2510a, it sometimes wouldn't read its own disks even though my Samsung DVD-ROM read them fine and reported 0 errors.
Supposedly the 3500 has much improved reading over the 2510a (which is why I recommend it). I kinda wished I waited just a few months to get one but I don't regret getting the 2510a anyway. I upgraded the firmware and it seems to read all the burns I've made thus far. Great writes and smooth curves when I test using nero's DVDspeed. This is with relatively cheap media too (Ritek G04).
I can vouch for this. If you get an NEC you MUST have another dvd drive. I at first thought there was something wrong with my 2500, but it burns perfectly every single disc I throw at it. It just really sucks at reading.
As has been said Plextor is pretty much the best, but you pay like 30% more for that quality. I still have an 8x cdrw drive that I don't want to get rid of just because it is perfect.
Pioneer is pretty good as well, I don't think anyone has mentioned. LiteOn, Pioneer, Plextor, you can't go wrong. NEC are the cheapest, I'd get that if you have another dvd drive, just in case.