You've got the system going on there
The system is set up right, especially for burning. I'd have the RAID separate from the other channels, and CD-RW and CD/DVD on separate channels on the MoBo

.
It's a great Mobo, and built for Win2K or XP.
The only thing I'd put on would be a SB Live! or SB Audigy (new card), since the AC97 codec on that mobo zaps CPU. A live! is $50 and well worth it, especially for games.
Otherwise, you've got it!