mmm...build your own computer? o.o
But yeah if you really have money to waste...
Dell (they recently bought AlienWare)
HP <-- I have experience with them, very good computers.
But I don't really get what you mean by country... Computers are made on every side of the globe depending on where the Manufacturers want their factory to be...
But If you want a DURABLE BEST COMPUTER, Your better off building it yourself...and if you don't know how to build, check the internet, or pay someone from best buy/Future Shop or any computer store and they will mount it for you. If you want the best build now, We need to know for what will you use it.