I briefly listened to the Aeons during the NYC canjam and bought a set on that same day. I did not have a chance to compare these with DT1770 but can just share a little on what I felt Aeon's sound sig. It sounds neutral and packs a punch in terms of its bass impact. Naturally, it does not have the quantity/quality of sub bass of the LCDs and all (cant comment on the DR 1770) but I think the bass impact and overall quantity is still sufficient for me. Clarity wise - I think for this price point, there are not many headphones that can rival it. Build quality seems good but dare not comment until I have gotten and tried mine for an extended period of time. Sound stage. This is a tricky one. Do note that its a closed cans and if you are thinking about broad concert like sound stage, I don't think that's going to happen. If you are thinking about an intimate lounge type of sound stage with good height, presence of instruments and an airiness to it, I think that you have hit the sweet spot.
On a side note - my friend did do an A/B of the DT 1770 and Aeons and soon after, he bought the Aeons. But that is his own opinion and he just casually mentioned it to me so YMMV. Take it with a pinch of pepper