The Aztec Monster is a product made/sold by Artmix. The relevant item from him for your 180c is the "Power Monster II"- it's a 2.5" SCSI hard drive form factor intended to fit your PowerBook. If you go with this option, get an "industrial" rated CF card or one that lists a wear-levelling feature. You shouldn't need to worry about longevity in that case. With the SCSI2SD, look for the same things in a Micro SD card-- it may require a bit more hunting. You can get an extension cord that adapts to a full size SD card- there tends to be more selection of suitable cards in full size.