re: What router should I buy?

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you will only get 900 Mbps to your chromecast

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I understand this..Your previous argument though makes it sound like you're only going to get 25 from Cox, so why not just have B/G

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The Chromecast will only use wireless n, even with an AC1700 router. So, you will only get 900 Mbps to your chromecast, regardless of whether you use an AC1700 router or N900. You are limited by the physical hardware inside the Chromecast. It won't get there any faster.

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Let's clarify something here. You don't get 900 Mbps from an 802.11n router. On a dual-band router you can get 450 Mbps on each band provided that your router has a dual radio and three antennas and supports channel bonding and your remote receiver has similar capabilities. Most 802.11n devices like Chromecast operate only on the 2.4GHZ band and have a single antenna and no channel bonding so their speed will be a maximum of 75 Mbps, not much more than 802.11g. With channel bonding (which really only works on the 5GHZ band) you can double the speed to 150 Mbps. Adding a second antenna will give you 300 Mbps and a third will give you the maximum of 450 Mbps. Devices that operate on the 2.4GHZ band will continue to be plagued with congestion and channel overlap regardless of the protocol used.