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If you don't do anything else to your bike then for God's sake grab yourself a titanium seatpost! I have a Stumpjumper made of that M2 stuff and while it's a great bike, aluminum (and carbon too) will kick you arse because it is so stiff and rigid. I never noticed how much of a beating I was getting until I rode Willow Koerber's tiny Litespeed at the '97 Collegiate Nationals. What a difference Ti makes! The metal is strong and light but most importantly, it flexes - adding some suspension qualities and cushioning your ride. I immediately purchased a Syncros post for my bike and have been glad ever since.
Oh yeah, while a Ti post might be nice don't spring for a Ti stem. I saw a Specialized Ti stem for sale for $19 and picked it up wondering what it would be like. After a very hairy downhill where I thought I was going to rip the bars off (Ti flexes and all....) I gave the stem to my fiancee for her $199 Giant and switched back to my Kore.