I was recently able to piece together a fairly decent Power Mac G4 MDD (FW800) system:

Dual 1.25 GHz G4

1.25 GB of RAM

240 GB HD (2x120) Ultra ATA/100

ATI Radeon 9000 Pro 64MB AGP 4x

DVD-R

Airport Extreme

Leopard 10.5.8 Clean Install on HDD 1

Tiger 10.4.11 w/ Classic 9.2.2 on HDD 2

For $145 USD

This will be my first "Modern" Mac system. I'm rather excited