said by IowaCowboy:
50/10 is more than adequate for normal residential use.
Amen. What people are forgetting is you are limited by the other end and all the stuff in between. Youtube will still suck, your online backups will still be constrained by the other end, uploading to your web site will still be bound by their connection, etc.
Heck, we have 25/something FIOS and even working in IT and streaming Netflix, running Crashplan, etc I hardly ever max it out. That's because the other end almost never will have enough bandwidth to serve you @ 10, 20, 50, 1Gbps, etc.