I know that most models are discontinued, thats why I asked about the two models in my original post. I suppose it wouldn't be too bad getting a second hand model, as long as it was in good condition, as I don't want a device thats going to die on my in a couple of months time. And another question, would I be better using XP instead of Vista with my MD unit?? Because that would probably be the reason that I downgrade to it (apart from speed).