200 clutch situation

[WLAMB@denver.echobay.com]

     As I was driving into the driveway Friday, my clutch pedal
     went to the floor but did not engage the clutch. Now  at idle,
     and in neutral there is distinctive high end, bad noise emmanating out 
     the the tranny/flywheel area. Pressing the clutch pedal down partially 
     reduces the noise. I checked both master and slave cylinders for
     external leaks but none were found.
     
     Do I have a bad master cylinder or has something gone south
     internally in the clutch assembly? The car has 117K miles and there 
     was some throw out bearing noise last winter that went into remission
     this spring.  Have I got a throw bearing preparing disintegrate?
     
     Looking at my Bentley book, a clutch job on this car is
     not one for first timers.  What is a reasonable price for
     this job providing I replace pressure plate, disc, TO 
     and pilot bearings as well.
     
     Bill