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.