Thanks a ton for your input, USAZorro and Kurt. Great stuff.

One more question, but certainly not the last (lol), if you don't mind...

How do I measure the crown race seat?

http://upload.wikimedia.org/wikipedi...abeled.svg.png

Would I measure the diameter of the crown? (referring to the above picture)

Here is a picture of what I'm working with: http://i48.tinypic.com/11j6l9x.jpg

Is the silver piece on the fork the crown? Or is that something removable?

I'm looking at the Shimano 105 headset: http://www.modernbike.com/itemgroup....176834&TID=367

I see that it says, crown race: 26.4 - that measurement refers to what you're referring to as the crown race seat, correct?

So in order for this piece to fit, the crown on the fork would have to be the same size? And the stack height of the frame/fork would have to be longer than the stack height of the headset pieces, per se - to ensure that there would be enough room to put the headset pieces, like the locknut, race, etc. on the bike - any extra space is compensated for by the usage of spacers, correct?

Hopefully I'm making sense.

Thanks for your patience guys.