G5 Montec 125 gr would be my choice. Extremly tough 1 piece design with cut on contact head. Just my opinion.

http://www.broadheadtests.com/index.html
This link should help you find what you need. I suggest a fixed blade head of modest cutting diameter. Muzzys, Stingers, Rocky Ti's, Wasp hammers, Slick tricks, Sonics, Wace'ms etc. are all great choices.

I agree, This is my first year with the Montec 100's(used to use Thunderheads and Spitfires) I can't say enough about them. They fly great and penetrate even better. Shot three does so far this year all have been passthroughs and all fell in sight. All of the blades were in good shape even after going through the deer and into the ground. I just washed them off and put them on the stone for a few minutes, then back into the quiver!

a family friend went for elk with a bow, he used 125 grain muzzy's. Based on their performance this year, my fixed blade of choice is the Slick Trick. You won't be disappointed, i guarantee it.