Wow, for such a lot of people with the same problem this seems like a tricky one to solve!
I've got the same issue i think:
Clutch Pedal OUT: Very noticable but subtle grinding sound
Clutch Pedal IN: No sound at all
Only between 2000-2500rpm in 1st, 2nd and 3rd: Loud grinding/crunching sound that increases with revs then disappears over 2500rpm.
I dont seem to have the whine that you guys are talking about though. Would mine be the same issue?