Tektro Oryx are supposed to be pretty good. I actually bought some and can't use them on the frame I wanted to use them on, the bosses weren't right on the frame (early '80's touring frame). I've got an old mtb frame I'm going to put them on. Anyway, I've not actually used them so I can't say for sure, but Rivendell puts them on some of their canti-equipped bikes, FWIW. They look nice and adjust very easily in terms of centering, and they come stock with threaded (with spherical washers) cartridge-type shoes, but you do need to replace the junk Tektro cartridge pads with salmon kool stop cartridge pads for v-brakes (this is the type of cartridge refill they use). Here's an ebay link:
http://cgi.ebay.com/New-Tektro-Oryx-...QQcmdZViewItem