In 2001, Apple re-designed the PowerMac G4 Line with the Quicksilver. This had a diffirent form factor than the previous Power Mac G4 computers, sporting a much sleeker case. This tough computer also includes one more PCI slot, has three PC133 RAM ports, and came with MacOS 9.2 and 10.1.
What can I say? This is my third mac, but its the first thats been around long enough (and was capable enough) for me to tinker with. Since I bought it last year, I've added another 128mb ram (totaling 256), a small storage drive from a performa 550, and a 4x SCSI CD RW. Future plans may involve a CPU upgrade, adding an ATA, USB, and possibly a firewire controller. Its main drive at the moment is a 2gb scsi, but once I get the ATA controller in I will upgrade it to something larger.