CW,
In addition to the excellent suggestions offered above, you may want to consider the idea of having a wired router, and a separate wireless access point, which in turn would be wired to the router. Depending on the physical locations of your networked devices, it may be very helpful to have the greater flexibility that would provide in terms of wireless access point positioning, and perhaps antenna orientation as well.
I too use Cablevision's Optonline service, btw, and it is fabulous. I pay a bit extra for their Optimum Boost option, which advertises 30 mbps downstream/4 mbps upstream. At my location in Connecticut it handily betters those speeds, usually giving me about 32 and 5, as measured via the
Speakeasy.net speed test. As you may be aware, Cablevision also offers 100 mbps downstream speeds (!), although at much greater cost.
Keep in mind also that with an always-on high speed cable connection, firewall protection (via either hardware or software) assumes added significance. I prefer a hardware firewall, in part because it eases the burdens on the computers, and in part because the models from
SonicWall are extremely good, although relatively expensive.
My home network pre-dates -N, and is all 54G. I use a SonicWall TZ170 hardware firewall/wired router, which cost about $450 a few years ago. Comparable current models, at similar or lower prices, are considerably more powerful than the TZ170, which has served me beautifully. See the listings and prices at
NewEgg.com.
I use a 54G wireless access point and signal amplifier from
Hawking Technology, which I have also been very pleased with, in terms of range, speed, and the ability to handle multiple wireless devices simultaneously. I have no knowledge of their -N products, but I would expect them to be well worth looking into.
Best regards,
-- Al