When you change routers, assuming systems involved have Gigabit capable nic cards and/or N wireless capability, a good thing to do is to replace all Cat-5 cable(s) on hardwire hook ups with Cat-6 for better potential throughput otherwise your system(s) default back to 10/100, just a thought.
I'm thinking of getting the E3200, E2500, or E1500 to replace my old WRT54Gv6. I don't plan on putting dd-wrt on it and I won't be using the USB. Many which has the better range for 2.4Ghz and has the best throughput between WAN and LAN. Or are the EA series smart routers better?