Didn't realize you were back to posting (have you on my autovote list though).
I like the term voluntaryist better than the others. I'm not exactly sure what the differences between the various terms are, but anything with the "anarch" root is bound to bring up people's defenses, while voluntaryist is much more benign sounding and also seems much harder to rebrand in the way anarchy has been rebranded in most people's minds to mean chaos.
Maybe one day, if the trend of increasing IQs continues, nobody will need to call themselves anything, because the principles will be obvious to everybody.