the symptoms he gave when he mentioned the clutch failing sounded to me like the gearbox, but the fact your getting a speedo output would imply that the gears themselves are fine and its likely the diff thats fubar
As people have said though, a gearbox costs buttons, and changing the box is no more difficult than changing the clutch!
You could quite easily go buy another car for a whole pile of stuff to break on that too!
These things happen. I ended up changing two calipers, a set of disks and pads on the rear of mine not long after i got it becuase of a siezed handbrake actuator on one side and a bent slider on the other (ie nothing wrong with the second caliper)