Don't discount Magnus, either the Stingers or even the Snuffers if you want really big holes. Stingers are razor sharp out of the package, and very easy to touch up. I use the recommended Accusharp and can get them razor sharp again with just a few strokes. They also fly very well. Cut on contact can be very, very effective heads. Do a search here or on other sites.

Also, Maguns has a lifetime, unconditional guarantee on their heads. You shoot a brick wall, just send it back for replacement, no questions asked. Really.

The others mentioned are good heads as well, but I have no personal experience with them.

Also check out 5 shots broadhead reviews. Very infomative.
http://www.broadheadtests.com/

Enjoy,
JMAC