ASUS RT-AC66U has a rather poor 2.4 GHz coverage, but if you are only using 5 GHz, it is ok. The newer model RT-AC68U improved on the 2.4 GHz range, but the Netgear 7000 has the best coverage.
All these routers are in the range of $300, I would think they are considered high range routers.
One cool feature I like about RT-AC68U is that the stock firmware can support dual WAN, though I have not tried this yet.