Good deal on a refurb ARRIS SURFBoard SB6183 cable modem
Newegg.com is selling a refurb ARRIS SURFBoard SB6183 DOCSIS 3.0 16x4 cable modem for USD$54.99. This modem will support all of the major US cable internet providers at speeds that are probably faster than anything they'll offer you in the next 3 years.
This modem is overkill for most of us because our ISPs don't offer the super fast internet service that this modem supports and they probably won't for several years. However, if you need a modem now, there's something to be said for getting this upgraded model at this awesome price for future proofing.
If you don't want any overkill, then check out the SURFBoard SB6141, which is really all you need, or see what else thewirecutter.com is recommended for best cable modem.