As highlighted in the other thread that talks about the Maige box, to have it streaming you're looking at least a 5-6Mb line for smooth playback. I say 'at least' because it's going to use the vast majority of that bandwidth, so if you want to check emails or surf the net whilst it's streaming, it is rather painful.
There has been times I've given getting a 2nd line installed due to my Internet nearly grinding to a halt when my GF is watching something on the Maige.