Welcome to the new Mitsumi CDR Forum. I hope to help as much as I can as moderator of this forum.
I should be able to help out a fair bit, and as webmaster of MitsumiCDR.com I have a few resources at my disposal.
The latest Mitsumi drives are 24x and 32x, and pretty good value for money.
Just to let you know, I have recently contacted Mitsumi to see what their stance on SD2 is. Perhaps they will bring out a compatible drive?
BTW: If you’re in the UK, a good place to get Mitsumi is dabs.com.