I have no experience with newer Macs whatsoever. I have a Rev A iMac, but believe it's not enough to play modern, games that where available for the Mac OS 9. So here is my wishlist:

• should be as silent as possible
  
• should be able to play all games that came out, even later ones, within reason though, i don't need the highest settings
  
• should be available at ebay for a tiny amount of money
  
• I don't mind the size, but i have a 19 inch LCD, so no builtin display.
  
• not a monster when it comes to energy
  
• TP fast ethernet is a must, so are USB2 connectors

Any models in particular i should consider?