I say get the Miroir. You've already missed out on one limited edition, but the price of that limited edition probably isn't going to sky-rocket anytime soon. Would you rather get the Speedy at retail and pick up another Ambre a little while down the road, or end up buying them BOTH at after-market prices?
Also, you have several months before you'd be carrying the Ambre, so that's all the more time to pick one up.
dITTO!