So, I have Subisu internet at my home in Nepal. The router that we use is not the greatest as the wireless is not good around the house. The internet is 15 MBPS i think.

 Bro, you will need a cable modem. Get the Motorola Surfboard ac modem and router (model SBG 6782 costs $200 at bestbuy). It supports the next generation wifi called ac. It also supports b/g/n. It runs on 2.4 Ghz and 5 Ghz so if you have a cordless phone at home, it won't interfere with the router, and you enjoy the same high speed. It has a great range of 450 ft. You won't need to upgrade for years.

You can also get a cheaper one which supports only b/g/n for $99 or less.

Take it to Nepal. Call your ISP and provide them the MAC id, they will activate that for you. Enjoy your new modem.

Subisu has its facebook page. They are quick on responding any queries, or others of their fan may chime in there too.