For the last 5 years I've been using InnerLoc. 75 gr most of the time, but occasionally 100 grains.

If I were to see a need to change right now I would get either Muzzy or Slick Tricks based on their construction and blade retention qualities. I'd lean more toward Muzzy simply because they cost about half what the most popular "latest and greatest" heads do and still do the same job.