A08XLA and 108 differences?

Hello i want to buy a DL dvd-burner but can’t decide
What are the differences between those 2?
Pioneer DVR-A08XLA and Pioneer DVR-108?
Should i go for one of those or waiting for Plextor PX-716A?

What stands for “Bulk Drive” ?

http://club.cdfreaks.com/showthread.php?t=108571

You need to decide for yourself.