Originally Posted by
Walter
I don't know Shimano stuff very well at all but my feeling is that if you want to change the drivetrain,
it's best to bite the bullet.... and change the drivetrain.
I'm not saying that Darwin's plan wouldn't work and just about everything pops up on eBay eventually but from what I understand mixing and matching Shimano is not easy.

Thanks for the comment, and I tend to agree....but then one can argue, if I upgrade the drivetrain maybe I should just get a whole new bike? It gets expensive very quickly! For now, it's DT shifters and 6 speeds in back, which to be honest still works quite well.
Then again, I do see a set of 8 speed brifters on Ebay....hmmm....maybe I can do a poor man's upgrade to 8 speed brifters and keep my FD/RD/crank rings etc.