Aleph 3 power resistors help!

I'm about to start building an Aleph 3, but I can't figure out what the watt ratting on the power resistors needs to be. Does anyone know what would be an adequate rating?
Also can anyone recomend a decent quality power resistor? I can't afford a Caddok or Vishay and can't find many other metal film power resistors. Thanks a bunch.