This post is based on nothing but my reading from this and other sites. I have no real world experience "yet" on broadhead performance.
I've yet to hear a bad thing about magnus heads. I am choosing to go with the 2 blade stingers only because elk will be part of my intended quarry and wanted as much penetration as possible. It's not the biggest cutting dia, which I am a little leary of, but sharpness, placement and penetration should make up for that issue.

So that being said, and SHARP, qulaity 2 blade head should do you fine. Magnus is a good one, but I've also heard good things about STOS, and Zwickey.