Hi Mark,

personally if i were you, id go for a project X shaft, 5.5 would probably be the best for your swing speed , but i guess its what you feel most confident with :) 

Speed isn't the only thing to consider when picking a shaft.  Tempo and ball flight also need to be considered.  The best thing to do is to get fit by a certified fitter.  If you are going to spend a thousand dollars you might as well have the right shaft in your irons.

get fitted. I have a 6 iron swing speed of 91-94. I was fitted for Nippon NS pro 950gh shafts regular flex. Awesome feel, nice and light, and great ball flight and spin. The pro that fitted me has the same ones and they are awesome!