Get Shimano BR550 cantilevers. They use regular v-brake cartridge pads, so they are easy to adjust. Mine do not squeal when properly toed in.
I didn't even bother with toe-in, and mine don't squeal. Note that the shorter, and straighter the straddle-cable is, the more powerful they are. They come with two cables, but due to my fenders, I had to use the longer cable.