CDFreaks has posted a review of the LG GSA-4163B Super Multi DVD-writer, a drive capable of writing DVD+R and DVD-R media at up to 16x, DVD+RW media up to 8x, DVD-RW media at up to 6x, and DVD+R DL media at up to 4x. Some top speeds there, but is this Korean import worth consideration for your system? Here's a snippet from their review:

The first point we would like to mention is the DVD+R9 DL support at 4x. The next point is the 16x DVD±R P-CAV writing technique that leads to faster burns compared with burns done by 16x Z-CLV and 16x CAV. Another important point is the 8x writing speed on DVD+RW and 6x writing speed on DVD-RW combined with good quality results. Speaking about quality – the LG GSA-4163B offers an excellent writing quality on CD-R’s, and not to forget on DVD+R/R9 DL media too. Further, the drive also supports DVD-ROM bitsetting on DVD+R/R9 media, which leads to high compatibility on i.e. DVD standalone devices. The LG GSA-4163B also extracts CD-DA disc at full speed – included copy protected audio CD’s, which is an advantage when ripping/extracting music. Due to “two sheep” burner and the DAO-RAW writing mode - the drive can be used to backup copy protected CD’s. It also supports writing CD-R’s up to 96 minutes, and can read back overburned CD-R’s up to 100 minutes. Since the LG GSA-4163B is a super-multi drive it also read and write DVD-RAM disc up to 5x.