I can only comment on Toronto..
keep in mind, most places come unfurnished so you need to factor in buying furniture.
TTC monthly pass in Toronto is $141.50, not $120.
basements are cheaper but winters are long. last thing most people want is to be stuck underground for 6-7 months of the year. plus in basements you have a higher chance of pipes bursting and being flooded.
Rent, probably average about 1000 a month.
Food, depends on the size of your family, say roughly $70 a week per person.
TTC, like i said 141.50 a month for an adult pass
Internet, probably at least 50 a month
Cable, about 60 a month for a basic package
furniture, have at least 1000 spare to buy basics if needed. ikea, walmart & dollarama are your friends
bills - some condos have bills included, if you go into a house or basement it'll be extra. at least another 100 a month
phone - budget for about 50 a month per plan for a decent plan
lets pretend that newcomers arent going to explore their new city or do any of the tourist stuff when they arrive. But to give an idea, adult pass to the aquarium is $33, its about $30 to go up the CN tower, its about $35 to do the bus tour, can go over to the islands for $7.50, Casa Loma costs about $20, I can't remember how much the zoo is, about 30 too I think. Day trip to Niagara falls, probably about a 100...
buy a car will cost a few thousand, insurance in TO is crazy high
rental insurance - some places require it, its not awful expensive but its just something extra
health insurance - you might get a job that has benefits, you might not, it'd be a good idea to have some private insurance until you find out either way.
don't forget, prices you see in stores are before tax is added and if you eat out or go to a bar, you need to tip.
point is, start up costs are high, after that it depends on your savings and how quickly you manage to get a decent paying job and what lifestyle you want, if you're happy spending time at home and not doing much it won't cost you an awful lot, if you like to explore and do activities and try new things, you'll have other costs to figure out.