A List of Top Modem Manufacturers. These are the best companies in their field. If you're looking to purchase a modem from the same best laptop brands you're used to, then you may have to step out of your comfort zone on these. As easy as buying a pre-built computer can be, there is a definite satisfaction that comes with building your own PC. Beyond the obvious monitor, keyboard, mouse, and speakers that sit on your desk.Who are the best modem manufacturers? The computer itself requires a CPU, motherboard, RAM, graphics card, sound card, network card, power supply, hard disk drive, power supply, and a case to put it all in. Some motherboards may also have those separate expansion cards already integrated. If you're careful, you may even be able to build your own custom machine for less money that it would cost for a pre-built model. When you upgrade your hardware, you can also sell the individual components to help offset your costs. And if you're looking for routers I suggest looking at these expert wireless router reviews to help find the perfect fit for your needs.