It all depends on how much you are willing to expend, and on finding a good deal.
Last May I bought a mint pair of Aeon-i demonstrators for slightly under $2000 (plus tax, full warranty). They were like new, not even broken in yet. At the same time I could have bought a new pair at the same shop for $2300 (plus tax).
For $300 less and warranty included, going for the demonstrators was the obvious choice. I could even see and hear my Aeons before I bought them.
If you can get new Aeon-is for $2300 or less, go for them.
If the price is more than that, check the Tweeters and Magnolias for clearances and find a better deal on a new or demonstrator pair. Buy used only if unsuccessful.