Don't go with supanet.
I'm with them and I currently trying to get my MAC code off them without paying. When I first saw their price, like you, I thought this has got to be too good to be true and that was the case. They have, as referred to
here, a bad boy pipe where if you downloaded more than around 800mb a day you go down to next to nothing speeds (worse than dial-up).
If you do think the price is right and that you don't mind your 'unlimited' transfer limited to 800mb per day then it's for you but please do have a look at that link and read about people's experiences. There have been a lot of people migrating away as well due to the poor customer service (akways blaming poor speeds on pipe upgrades which took months to come and then finally admitted about the throttling)