One that locks, stays tight, is strong, is smooth, and looks cool. I'm thinking that there might be threaded BMX headsets, but they have to have the same thread size as the Razor to work with all threaded forks.
There are countless threaded headsets, use Google. You don't need a threaded headset though, all that does is limit your possibilities. Threadless headsets let you run threaded or threadless forks, whereas threaded headsets force you to run threaded forks. Just get a threadless headset.
Thanks guys. I thought a threadlss headset woudn't work with a threaded fork because that's what I lot of people say. I'm going to try the using one with a lock bolt.