There has been mention in articles that Apple is on board with going to Wireless N/AC. When will this all materialize - your guess is as good as mine.
I am unsure why you insist on wanting an AE router. I have two of them (older and newer) and gladly changed over to another brand that happened to have 7 ethernet ports built in. This served my needs but it seems you have slightly different needs.
If you go to SmallNetBuilder site, you can see a comparison of various wireless routers and their suggested price (plus some real world prices). This would be a good way to go and you will notice that the AE does "okay" but is no where near the top of the line in wireless ability. Btw, I too had a Dlink 655 that I used for many many years. It was better able to handle some security challenges that the AE simply was inadequate or rather, dumbed down.
In short, get a good Wireless N router and don't get married to the AE as an option. If you find later that there is a good AC router out there, consider using your first purchase as an access point / bridge so that nothing is wasted.