Just remember, when you use one of those SCSI-IDE bridges, you will still be limited to the speed of the SCSI bus even though the drive you get may be capable of faster reads and writes on an IDE bus, so don't expect that a newer, faster drive will show big performance improvements.

And isn't there a limit to the size of drives you can use in older Macs? I don't think you can use a 2tb drive with the disk controller in a 68k machine.