A SATA drive may offer some performance increase, but I wouldn't get a drive just because it's the fastest. The media you're burning to has a huge impact on how fast it will allow the drive to burn. I buy cheaper disks that usually don't burn well at 16x, so I think it's safe to say since that's all they're rated at, they probably won't do to well at 22x.
AMD Athlon 64 6000+
2GB DDR2 800
Pioneer DL DVD±RW
500GB Samsung SATA 3.0
Radeon X800