IMO, there are better choices than the DRU-700A if you want to upgrade. Most Sony burners are rebadged LiteOn drives, which can be had for less than the Sony-named drives. LiteOn drives are great CD burners, though many consider their DVD burning capabilities as average to slightly above. For that price, I'd be more likely to save $30 and buy an NEC 3500A online, or buy a Pioneer 108 online which isn't as capable with CDs as the NEC but is a competent DVD burner, or spend a little more and buy a Plextor PX-716A at Best Buy if you don't like online retail and are really picky about brands.
Intel Q9450 @3.2GHz, Gigabyte GA EP45-UD3P, 4 x 2GB G.Skill @4-4-4-12
Antec P160SW case (modded), Xigmatek 750w PSU
3x 500GB (RAID-5), , OptiArc 7200S, ASUS E818A3T
Creative X-Fi XtremeGamer, Hauppauge HVR-1800, Radeon 4890