Want something with some utilitarian purposes? I can recommend Newt Livesay's products 100%. Try the NRGS or the Executive NRGS. Of course, the Woo is my all time favorite!
Lynn Griffith (or however the heck you spell his name!) makes some nice looking models, but I have yet to hold one. I don't like the looks of his MNK series much, but most of the other stuff he has intrigues me!
The REKAT Hobbit Utility or Hobbit Fang are great little knives, but are becoming harder to find.
I own about 10 different neck knives and the only one I don't like is a Taipan by Trace Rinaldi. Trace is a nice guy and makes some good stuff, but I just don't like this model.
As advised above, just do a search for "Neck Knives" here on the forums, you will find LOTS of info.