I shot Montecs last fall and they did a nice job. They flew and performed well, even put one completely through the spine on a large doe. That head was bent, along with another one that wont be reusable either, but both were severly punished. They are a tough head.
I also really like the Rock Mountian Titainium heads. Very sharp and shoot great. Two drawbacks, they are pricey and a little harder to assemble than the muzzy type heads.