The only differences - EA2700 has the Connect Cloud and Gigabit ports. If you have devices that you can plug directly to the router that have gig technology then go for the EA2700, otherwise E2500 is not too bad. Both Models that you have listed are N Dual Band Routers.
Technical details comparison can be found here
Hmmm...I don't see a spec if it supports wireless bridging or repeating to expand wireless network range. My Netgear Dual Band router as a Repeating functionality. I would download the manual before you buy so that you'd know what other features you will be expecting and perhaps utilize them.