There are lot' s of good mechanicals, but of the ones I have tested the steelheads, Snypers and shockwaves have impressed me the most. Some other good heads are sidewinders, spitfires and jackhammers. I also like the vortex line of heads but most of them have super large cutting diameters. I know there are also several new and promising heads coming out soon as well. It was already stated, but my tests are only a starting point, and I think you are doing the very best thing. By picking a few differnt heads and testing them yourself you will see what works best for you setup and gives you the most confidence. Let us know what you end up with after the smoke has cleared.