What cantis are you using?

Sheldon Brown has a great page about setting up cantis. I followed it when building my commuter, and I've been really happy with the brakes (older Avid Shorty 6s). I found the stuff about "mechanical advantage" to be particularly interesting and useful.

My only experience with v-brakes and travel agents wasn't good. I can't say for certain if it was the travel agents or just crappy v-brakes, but I don't intend to repeat it anytime soon.