Still waiting for my new bike to arrive, so I can pick yet!
However, my favorite component on any of my bikes is usually the cranks. I don't know why, I just love a good set of stiff cranks with nice rings that shift well. I love RaceFace Cranks, my new bike has Profile Racing cranks that I used when I raced BMX, so I know I'll like those.
Second in my ranking would have to be the stem. I really like the Azonic shorty stems, but that new RaceFace Diablo is hot! (pun inteneded).
L8R
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger