You may want GBers to check the archives/hoards:
SK Fiber Pure Energy (Driver) or TT80s (FWs)
Mercury Performance (+)
TourSwing Okatos
I miss Tim H's old site that used to frequency shafts so you could compare and figure out which shafts had similar playing characteristics. I think there is a current site that requires an annual subscription, but I forget it's name.
If you are looking for something more modern, I believe some have had success with the Fujikura Pro 2.0...
Good Luck with the hunt and report back with what you decide on...I for one would be interested in what you decide.