Netgear EX6110 has a feature called "fastlane" wherein you transmit at 2.4 band and receive at 5ghz band or vice-versa and this gives you full bandwidth without interference.
This one goes for 6.5k and you can install Advanced Tomato firmware on it. TomatoUSB also supports GPT hard drives.
http://www.amazon.in/Asus-RT-N-18U-2-4ghz-Wireless/dp/B00NOWFV32/ref=sr_1_4?ie=UTF8&qid=1477665338&sr=8-4&keywords=asus+router