When you say 5th gen, you mean you got the model that came out in June 2011? That's the 5th gen release date, unless you meant the 6th gen?
I have a 5 gen and a 2 gen. Use the 2 gen as an extender though I don't know if it does much good.
Have always had double NAT issues with the AE router, but I'm an idiot so take that into account.
I wouldn't mind getting a new router if I could actually get closer to my rated speeds in most of the house. I had looked at the new AE router, but it doesn't get high marks once you get outside of the apple community. I have the main router in the basement next to the modem and it has to reach up two more floors, so it gets a workout. I have the 5 gen in the basement and the 2 gen on the second floor.
http://thewirecutter.com/reviews/best-wi-fi-router/
They didn't find the price/performance ratio was that great and moreso considering the features excluded.
I dunno, I would still lean towards an AE just based on my experience.