Choosing a modem based on the type of internet connection you (will) have, there are a few other variables or requirements that you should look for before purchasing.
1. Compatibility – Is the modem compatible with your computer (Windows, Mac, Linux, etc)? Furthermore, is it compatible with your computer’s software (7, Vista, 10.4, etc)?
2. Upload/download speeds – Next you’ll want to check the “upstream” and “downstream” speeds, as they’ll differ from model to model. Often times it’ll even be different from one direction (upload) to the next (download).
3. Security – Does the modem support security features such as WPS (Wi-Fi Protected Setup), WPA/WPA2 Security Protocol and WEP, TKIP and AES (64/128 bit) Encryption?
4. Size & mounting options – How big/small is the modem? Will it fit well with your other computer equipment? Some modems can even be attached to the wall. Is this something you’d be interested in?
5. Price – Modems will vary in price from as little as $10 to as much as $175+. The difference in price comes down to the type of connection, speeds and any features or “bells and whistles.” Most people could probably get away with spending $50-$75 on a modem and be perfectly happy (from my experience).
I would also take the time to read online reviews at different retailers and review sites such as Amazon, CNET and Consumer Research. While the (positive/negative) reviews shouldn’t impact your decision 100%, you can go through them and see what the common praises and complaints are.
Another option is to get your modem from your internet service provider. The upside is that it’ll be their equipment, so if you have any problems installing it they should be able to help you quickly. The downside (for me) is that you have to rent the equipment on a monthly basis for a few bucks a month. After a year of service (or two), you’ve already purchased a router two. Then if you cancel your service you have to give your modem, and any other equipment you’re renting, back to the ISP.