Looking for a front long reach brake caliper, needs to go to 57mm at least. Preferably nutted, although not essential as I guess I could drill the fork out.
Something that would look okay alongside a Tektro R556, as that's what I have for the rear. So another R556 or a Tektro R538 would be ideal. Or a Dia Compe BRS101. Or anything nice you want to get rid of!
Would consider a pair if someone's got something interesting that would have a real deep drop for the rear (70mm I think). Rivendell's Silver sidepulls look nice!