I think any good fixed blade that you can get to fly perfectly will work. A 2 blade broadhead like Iron Wills, Cutthroats, etc will be best for penetration. I am going to be trying the 1 inch version of Tooth of the Arrow broadhead. If those don't fly well, I'll try Iron Wills.
Spend the extra time to properly tune your bow and bare shaft tuning really really helps to get your best arrow flight. Properly timing your cams is really important as well.
I would shy away from mechanicals but that is just my opinion. I know some guys use them and have good success with elk. I have used them and had great success on whitetails. I just think elk are in a league above whitetails and a fixed blade should be used.
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