How do I decipher shaft selection?

[Wood]

Maybe someone can help. I'm going to reshaft away on my trusty MP-30's, dumping the stock tru tempers for some sort of rifled upgrade, but I can't get past the technical jargon on any of the websites. If anyone can help, or give a recomendation as to where I should start the auditions, it would be appreciated. Rifle vs. project x? I'm only interested in metal shafts.

Info to help you help me:
Carry distances:
9 iron- @ 150-155
6 iron- @ 180-185
3 iron- @ 210-215

I have a traditional one plane swing, with a moderatley high swing speed. Work the ball both ways, but favor a high fade with my irons when all shots are available.

[wachesawgolfer]

Project X should play stiffer than the standard rifle at the same flex per the dealers and fitters I have spoken to.

[cantputt]

we have the same distances.. i guess that means we have similar swing speeds? well i use 6.5 rifles. check em out they are HOT :P