Hey Dave,
The Tier 1 or 3, is probably too expensive, for the average consumer, and mainly for businesses. They are probably the fastest, but not really available to the public.
The fastest I've seen, is Verizon's FiOS. Heres some packages and prices, that they offer:
http://www22.verizon.com/content/con...and+prices.htm
They're not available everywhere, but it wouldn't hurt to check. They are expanding though.
They do provide wireless connectivity. But I would always prefer wired connectivity, as it's less interference, compared to wireless. But yes, they do provide it, and I think it's as many computers you have, that are capable of wireless internet, that can connect to a wireless router.