Anarchy. I don't believe in taxes, but still would like to see a basic income through Natural Resources shares (Natural Resources are our common inheritance and must be shared)
Free market for everything else, with only guiding rule the principle of non-aggression towards people, property and the environment.
I'm an anarchist at heart but also see online direct democracy (liquid democracy with forums replacing congress) as something I could live with. with at least 90%+ consensus among all citizens for any rule to be approved. Anarchy requires 100% consensus but I doubt that will ever be possible unless in very tight nit communities.