I would definately go for a short haired pair, the long haired look glam but it can be really irritating to care for them after a while (well I don't mind but then I'm odd ;D) for a beginner it may feel like a lot to do. Sows usually are better at sticking together and not fighting, although that isn't always the case - if a rescue centre has bonded them they should be ok though. Boars can also be a good bet too, but it depends if you're prepared to split them up etc if they fight.