A friend of mine is getting a 733mhz G4 Quicksilver Powermac off of a friend for about $500. What's the best video card, HD, CPU, RAM, etc. he can put into it? What would you do if you had one to upgrade? In other words, what's the best he can put into it without it being overkill? (A Radeon 9800 coupled with a 733mhz G4 would be wasted power, methinks, no?) Suggestions?