Motorola Cable Modem SB 6141 & Cisco router - $50 (waco)
You can save $$$$ by buying this instead of renting from Time Warner. I used this for a few months on TW Cable with no problems. It is on their official list of supported routers. The Cisco can then be used to create a secure wireless network in your home. Asking $50 for both since these run for about 80 refurbished on amazon by themselves and Im including a good wifi router.