If you're from the Anglo Antipodes, i.e. New Zealand or Australia, you are either a Marmite person (good, kind, straight teeth and an intelligent smile) or you are a Vegamite type (rotter, without conscience, and your mama dresses you funny).

Best brand is Sanitarium, available only in Aus or NZ from my experience. It's not hard to find someone who can mail it to you.
http://www.everythingaustralian.com/sanmar25.html