I'm going to get either a 250GB 7200rpm OWC Mercury Elite-AL Pro usb 2 and firewire 400. $129 http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/400+USB2/ or a 160GB 5400rpm OWC Mercury On-The-Go 2.5" firewire 400 only portable drive. $139 http://eshop.macsales.com/shop/firewire/on-the-go This drives main purpose will be as a time machine drive connected to a Mac Mini 1.83 Core2Duo and also backing-up a 1.67 G4 powerbook over a G network. Both computers have 80GB hard drives and both have about 50GB free. I don't see either of them filling up fast. The Elite Al pro is bigger, faster and cheaper. The on the go. is bus powered = less wires, easier to move, physically smaller. I'm leaning towards the on the go drive. I hate wires. If I need to move or backup a large file from the powerbook I can easily move it to the powerbook to do the transfer. Sometimes I need to transfer files from offsite locations often I can move these files with a CD. CD's can kinda be a hassle so having a portable hard drive would be cool. Since both computer hard drives are only 80GB each 160GB total for backup seems like enough. So I'm choosing less, wires and portability over more space and faster rpms. Any flaws in my logic?