The 2.4 Ghz WiFi band is very crowded in my neighborhood and I'm looking to take advantage of the much quieter 5 Ghz band. My current WiFi router is a Buffalo WHR-HP-300N 802.11a/b/g/n device that has only 2.4 Ghz WiFi and 10/100 Ethernet ports (non-gigabit).
I'm looking for a device that is either 802.11a/b/g/n or 802.11a/b/g/n/ac that can do 2.4 Ghz and 5 Ghz at the same time. Gigabit ports are a plus, but not required. I'd prefer removable external antennas, but fixed ones are okay too. I'd like to stay away from internal antennas for range reasons (especially for the 5 Ghz band).
Does anyone have anything like this that they are happy with? Bonus if it is fully DD-WRT-, OpenWRT-, Tomato-, or Tomato-by-Shibby-compatible.