All good advice. If ritchey is not quality enough for you, why not just go full Campagnolo Pista? That was kind of sarcastic In my experiences, DuraAce and Pista just aren't much more durable than All City or Alex, but they are more finely crafted. The only noticeable jump in quality that I've ever noticed in components is in those produced by Pacific to be equipped on their bikes sold in the US in stores like walmart, dick's and target- they're aweful. I can render worthless a full DA drivetrain in about the same number of miles as I could anything else that you have on your current fixed or any of the bits that have been suggested. I will, though, second the Brooks or charge options for the saddle. I currently only use Brooks