Unless you have a really slow computer that's currently driving you mad, I'd suggest waiting. You'd most likely have to wait a spell while everyone's shipping AmigaOnes to the people who have ordered before you. And as said before, until AOS4 comes out, you'll be running linux if anything on it.
BTW: Anyone else notice that anytime AmigaOne or Pegasos is the subject of discussion, there's always at least one post that remarks about the thread erupting in to a flame fest? Perhaps we should appoint someone to do a running commentary on these discussions? :-P