PPC at this time doesn't make any difference about the burning speed, with Amiga OS3.x. There are only 68k burning apps available at the moment, so a 68060 CPU is the best you can get. I doubt that there would be much, if any defference between an A2000 with Blizzard 2060 and an A1200 with Blizzard 1260, unless of course you use Fast ATA controller on the A1200 which is a bit faster than the Blizzard Fast SCSI-2 controller, however with no DMA.