Forza's cyclocross Cirrus Pro CS Cantilever brakes are really very very good cantilever brakes, stiff and powerful, probably the best I've tried.
Check to see they fit your bike first though. As I'll explain in detail below, I had issues on some bikes, and not others. Having said that, when they do fit, they are good, so we'll ignore that detail for now.
If you don't mind the fiddly set up, and the brakes actually line up with your bike and wheel rim combination these Forzas are a good buy.