Aaron, even if you get the MC changed the problem is likely to come back because it seems to be a design fault. IN the first 10 minutes of driving mine feels fine that it goes creaky again after the problem was not present for about a year.

I've been trying to research some alternative options... MC's from other cars or maybe even something like this C5 vette owner did

http://tradezone.com/vette/clutchmaster.html

basically used a brake master cylinder from AP racing and modified/connected it to work as the clutch master cylinder instead.

I've really had enough of the MC creak.. there must be a more stable long term solution out there somewhere...