You can of course, choose an "unlimited" connection which basically slows you down after your cap or you can do something stupid like I did, which is choose the 60GB per month on unlimited cable. No restriction on torrent, but if you stupidly leave a BitTorrent on and haven't set a default upload limit then it's capable of chewing up around 10GB in a day or two (I now regret my high upload speed).
The final straw was what I was charged for the extra data - $0.15/MB (not changed for some time). So I go from paying around $2 a gigabyte to around $150 per GB giving me around A$1500 bill for the month.
So if you must use torrents, make sure your client has a way to limit your upload speed - especially when it's seeding
