Hmmm... this is an interesting thread, and a topic that comes up often, as it should, because, ethically, we are talking about a clean kill here. I applaud this... I have been on some compound shooting forums where guys talk about speed and 'whack em stack em'... its refreshing to have a discussion about ethical hunting that puts the animal down as quickly and painlessly as possible.
For me, I have only taken one deer (2nd year hunting) and did so with the training wheels, a mechanical broadhead, and a 35 yd shot that put the deer down in 20 yds flat. What I saw there was a BIG hole and complete pass through. The broad head had 5 blades, 2 cut on contact, then 3 opening 'main' blades. I had good placement high on 1 lung slights back and quartering forward to the 2nd lung. Now, all that said, with my recurve (which I still have yet to kill anything with) I use 2 blade broadheads. I have the Eclipse single bevels (which are HARD to sharpen due to the very think tip of the blade... infact, Sharpster suggested I put a double bevel on the tip and single on the main blade... easier said then done, yet certainly easier than trying get a single bevel all the way down with a file... shulda got that wheel sharpening system from Alaskanbowhunting!) Right now, I have sharp tip, but sharper main blade. I believe these will zip through a whitetail with a good clean shot, and the single bevel nature should give me a little extra punch. If I get an opportunity to use one this season, I'll post the results!