So I plan on picking up the new AirPort Extreme on Wednesday. Any idea what cable modem to buy? Preferably under $75. The ones I found on eBay are mostly limited to 150mbps they say. Is this right? Wireless N goes to 300mbps correct? http://www.amazon.com/Arris-Motorol...F8&qid=1370912356&sr=8-1&keywords=Cable+modem Would this bottleneck me? Thanks!