Personally, I use my deer setup which happen to be tipped with Grim Reaper Razortips. If you deer hunt your setup would be quite adequate as well.
Otherwise the general consesus is that a large cutting diameter is the way to go. Look into the NAP Gobbler Getters, Rage, and Grim Reaper among others. If you are wanting to shoot them in the head look at the Gobbler Guillotines or the Magnus Bullheads.
Have fun!