Oh, I forgot to say ALWAYS get AT LEAST two. They are so incredibly social and although they thrive on human company, they do need other pigs for company also if you've got a big area (more than half an acre) they'll struggle to keep on top of the vegitation growth, so the more the merrier.
A quick word of warning too - either buy a same sex group or make sure the males are castrated, Kunes become sexualy mature from 3 months
(but a drawback of castration is that they do grow slower
)
HTH
Karen x