See if Telgo(telgocomm.ca) or Start.ca (start.ca) offer service in your area. I know Telgo's fiber services are at the speed you need for $10 a month less.
As far as I know, no one except Bell Aliant, Eastlink, and MegaStream offer internet service in Halifax. I know a friend who just moved there. He checked out all options and ended up getting MegaStream 20M standalone service for $49.95/mth but had to buy the modem. I spoke with him and his wife 2 days ago and he says service is working fine.