I was not aware there was an issue taking ATA66 drives in a Pismo. Even the Wallstreets could take them. You can drop an ATA100 drive in it, because the machine will read it as an ATA66, so there are no worries.
MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop