If you live somewhere that Wind Mobile serve, you can go with them. If not, the major carriers have less expensive versions of themselves for absolutely no good reason I can see:
Rogers -> Fido
Telus -> Koodo
Bell -> Virgin, maybe others.. Chatr? I forget.
PetroCan and 7-Eleven are on the Rogers network too I think.
How much do you use your phones? Koodo have $60 plans that are unlimited. The downside is that, if you go on a lower plan, they charge by rounding to the nearest minute not the nearest second... dirty.
Now - there are changes coming to how long operators are allowed to make their contracts this year, I think - 2 years max, from the 3 year plans you get ripped off by at the moment.
You will have to pay early termination fees, but I think these change, and you should be able to get out free later on once you've hit 2 years, by law. You'd have to look into it.
I live outside a Wind zone but even then (on pay as you go) it's only 10c/minute (I don't use data). I buy a $40 refill every 6 months or so - but of course if you're using your phone more you'd need to analyse more closely your needs. Depending on who you go with you should be able to unlock your current phones and be ok... With Koodo, if you're not 'paying off a tab' you get a 10% discount on your bill.
Without knowing how many minutes a month you use it's hard to tell, but as I said, with Koodo, you'd be looking at $60 + tax - 10% for using your own device. There may be discounts for having more than one account, too. $130 is better than $180, but if you are willing you can reduce your minutes used by using Dell Voice/Fongo - which gives you an alternate number and is free to call all Canadian numbers - when on Wifi, etc.