I would go with asus all the way they have a wide aray of models and pricing and the software that comes with it is easy to use and highly customizable , I have been using 1 of their cheapt $40 wireless N router for the last 3 years in a 1500sqf apartment with no problems and now im upgrading to one of their wireless AC models. most if their higher end router use a AI radar that detects where your devices are and trys to focus the signal to those devices
so the question is what is the price rang you are looking for
wireless N models
RT-N65U DUAL PROCESSOR $117(highly recommend for wireless n)
http://www.newegg.com/Product/Product.a ... 6833320131RT-N56U $94(basically the same as the 65u but single cpu)
http://www.newegg.com/Product/Product.a ... 6833320062RT-N66U $139(probable best wireless N router you can get )
wireless AC router
RT-AC56U $159(this is the one im waiting to get)
http://www.newegg.com/Product/Product.a ... 6833320167RT-AC66U $189(one of the strongest routers out there)
http://www.newegg.com/Product/Product.a ... 6833320115also something I always recommend being that I work for a local ISP here and listen to people complain of poor wifi performance is if you have an android phone or tablet is download wifi analyzer(its free) and see if your router is sharing the same channel as other wireless devices, if show change the setting on the router from auto to a specific channel that is not being used and has less interference