Muzzys are a good head but I've seen a few times where they did not fly the same as field tips. I am talking of the Muzzys with the trocar tip. The Muzzy Phanthoms fly terrific. Now you didn't say what your set up is. But IMO, if you want a good quality fixed blade, you can't go wrong with the Slick Trick Viper Trick. Its strong, sharp, and flies true.
Another good blade is the Magnus Stinger or Buzzcut. Both of these fly great but aren't as durable as the Slick Tricks. The Muzzy Phanthoms can come apart in a foam target when pulled out because of their design.
So those are my 3 choices for a fixed blade. Phanthom, Stinger, or Viper Trick