This depends on the use. If we wanted a bleeder to insure at least critical current was drawn, we might want a differnet value than if we just wanted a resistor to bleed the PS capacitors down. Back to the question: bleeder R. We need this R only to provide a discharge path. V-squared over R to determine power requirements. Let's say 200V. Anything over 40kOhm will need less than a watt. Two 1/2 watt 100k in parallel, is reasonable( and available from Radio Shack @ $1 for 5).
regards,
Douglas