- 700c usually increases value.
- you can't get more narrow than 1" tires for 27" tires (like 23mm).
- 23c tires are usually easier to find and less expensive than 1".
- if building new wheels, 700c will not feel guilt-ridden, like you're wasting funds in a time warp.
- use really cool old hubs that spin perfectly and you can polish easily, like campy record.
- use a 32h in front and 36h in the rear.