Modem Purchasing Help

[Shikarikato]

Can anyone here help me find a Docsis 3.0 Modem?
After going through about 6 Cox Communication agents over live support I just found out we've been paying for premier service for the past 4 years or so but they told us to purchase a Docsis 2.0 Modem whenever we switched to them 4 years ago so we've been only getting about 25 down instead of the 50 down we've been paying for this whole time. Sad thing is Cox is the best ISP in Las Vegas and they can just run a monopoly, I have friends with other ISPs and I've heard they've had downtime for a few days straight, the longest we've had downtime is only about an hour or two. Very sad marketing business. 

[extremescouter]

This has great reviews: http://www.amazon.com/Motorola-SB6121-SURFboard-DOCSIS-Cable/dp/B004XC6GJ0/ref=sr_1_1?ie=UTF8&qid=1369530399&sr=8-1&keywords=motorola+modem

[Shikarikato]

Woops forgot to mention that it needs to be a telephony modem, I already saw that one but notices that it doesn't support telephone.

@Edit: Now that I think about it, wouldn't have a coaxial splitter go from the cable and have one go into my current one just for telephone and the other go into another just for internet? It would be cheaper... I'll see what Cox has to say about it.