I love carrying a fixed blade around my neck. I still carry a folder but I find this method of carry is the most convenient way to carry a knife (especially a fixed blade).
I have a CRK Professional Soldier and a Hinderer Flashpoint that I use as neck knives. The Flashpoint really is a perfect neck knife as far as size. The CRK is kind of pushing it as far as size but since there are no scales on the handle it's not too heavy and sometimes it is nice to have a bigger 3.5" fixed blade.
Another more price friendly option would be an ESEE Izula. I have a stainless steel model I carry in the same configuration.