It's hard to say what's under the covers of this drive, but if you call this vendor, they should be able to tell you. And yes, I believe the Apple-shipped model is a Pioneer A05/105.
Look on
dealmac for the best deals on this stuff. Right now, esBuy.com has a Pioneer 105 for $244, I think. But I'm waiting for Staples.com to run another sale on the Cendyne drive, which is a Pioneer under the hood. This has been down to $150-170.
There are lots of threads on this here. Do a search for "Pioneer DVD".