At that draw weight and a little older bow, I would recommend a fixed blade head. I've killed a bunch of stuff with Slick Tricks. They are extremely durable, scary sharp, and fly like darts. There are plenty of good fixed blade choices out there, but Slicks are my #1 choice. With the amount of kinetic energy you will be getting with your setup, you can avoid a possible problem with penetration if you are using a fixed blade head. Mechs eat up a lot of KE on the way in. I shoot Grim Reapers for my mech choice, but i'm pushing nearly 85# or KE, so i'm FAR from worried about penetration.