Adding a new cable modem to your home or office internet can be beneficial in a couple ways. First, it can improve the performance of the internet speed delivered into your home or office. And second, potential cost savings in owning your own unit, as you may be paying monthly for your current modem as company owned equipment from your provider. The most common cable modem brand is Motorola. Motorola modems are a benchmark brand because of their successful in overall reliability.
Motorola offers a variety of different SURFboard model cable modems. Depending on the connectivity, USB or Cat5 cable, there are an assortment of cable modems available from Motorola to meet your home and office needs. The Motorola SURFboard models come with different bandwidth speeds as well. The technology has not changed significantly over the past few years but depending on how many devices will be used on the network, it may become important to have a unit like the Motorola SURFboard SB6121 that pumps out 195 mbps. This particular model is great for any up-streaming or down-streaming data needs, and has the ability for up to 4 different channels to draw from, meaning you can have up to 4 wire/wireless routers connected to it at once.
There are other avenues you can explore with the cable modem market such as another quality brand name such as Linksys, Zoom, or Cisco. These brands are all highly used for communication purposes, but are not quite as common in the home and small office environments. As long as you make sure the specifications are sufficient for your own needs regarding speed and connectivity then there isn't much to worry about.