I bought a Mac G4/400 "Sawtooth" for $250 clams on eBay. Added an ATI Radeon 9000 Pro for $75. Paid another $50 to bring the total RAM to 640mb. Runs everything perfectly fine, OSX 10.4.5, Microsoft Word, PhotoShopCS2, InDesignCS2, IllustratorCS2. Great for surfing the web, too. It has built-in Ethernet so networking is simple. I have a 20" Apple monitor I've been using for about 8 years. Dell has monitors for supercheap...look at refurbs. I put the big bucks into a gaming PC. Good luck.
OtherWorld Computing for Mac HD/RAM/Monitors/Video/Audio upgrades.