why dont you just download shoutcast and broadcast from home. in the uk you can get 20mb connection, Very realiable with unmetered bandwidth. using 10mb alone for the radio broadcasting would be enough.
I doubt that would be a reliable solution until it is hosted on dedicated machine. Why don't you buy some descent dedicated server, post your requirements here http://forums.digitalpoint.com/forumdisplay.php?f=98
when i own a website caled mix-it-up-recordings.com i always used shoutcast and never had a problem. i left other users connect to an old pc i had and i never had problems broadcasting