TIP-
all the new school mini's have a front caliper similar to the one on minihaha's ripper
-they dont use cantis, as i imagine they are too difficult to fit
-so, ask for the calipers on bmx talk
-or true to the old school stylee
-bitd, the popular choice was campy calipers, although they were then and still are, well dear
http://cgi.ebay.co.uk/campaqnolo-athena-road-bike-brake-calipers-racer_W0QQitemZ7237821231QQcategoryZ27949QQssPageNameZWDVWQQrdZ1QQcmdZViewItem#ebayphotohostingthe weinmann calipers came in all different sizes, and you will not have the brake block square to a skinny rim, if you use one too large
-search for campagnolo calipers on ebay, and get a period correct one, but be warned one you start looking for campy stuff, you will end up with hubs cranks etc
further more, small sized crank sets are availaable -or were available at 150mm up -ta campy etc, as they are used in tandems, plus don't be caught out buying campy hubs with 40 holes in rear and 28/32.36 in front, as these are designed for tandems, ie the muti spoked rear wheel is better equipped for a 2 passenger bicycle
