I am trying to choose between two seedboxes, one with a 10Mbit (450GB/mo cap) and a 100Mbit (650GB/mo cap). Right now I have a 15/2 line and I have no problem with my download speed. I just want to be able to seed back torrents faster to share more and so I can play COD4 when I want, rather than wait hours to seed a DVD back. I think the 100 line is too fast because I will eat through the bandwith very quickly.
Of course, I could place a strict uplaod or ratio limit on the 100 line to keep myself within the cap but seed crazy fast, but the temptation to let it rip will likely be too strong.
I'm not a member of any really elite trackers though and swarm speeds are usually between 1-5Mbits on the faster torrents I grab.