i have used the muzzy 4's and the past few years i have used Muzzy Phantoms.. the Phantoms are just butt nasty good. mine have left blood trails one would have thought were laid by a bullet. i use the 4 blade phantoms
http://www.shopatron.com/products/category/Muzzy+Phantom+Broadheads/182.0.1.1.1928.7266.0.0.0
http://www.shopatron.com/products/category/Muzzy+Phantom+Broadheads/182.0.1.1.1928.7266.0.0.0