A quick update. I got my wife another Petro Can phone for Christmas (we had lost our old one and were beginning to miss it). With two cars now, though, we found we needed a second one. I really wanted a bluetooth-enabled one for hands-free in the car, and PetroCan offers only one model like that -- and both locations I visited didn't have it. So I started looking around a bit more and got interested in President's Choice.
They still have 20 cents/minute (Petro Can has gone up to 25), and they don't charge anything for e-911 (it's free in Ontario and a few other provinces, and in the provinces where it's not free it's still a lot cheaper than PetroCan). Also, most of their phones are not SIM-card capable, so the cheap option of buying a pre-paid SIM in the states when on vacation is not possible (at least not with all models; and the one that is SIM-compatible, I don't know if it's unlocked or not).
Since we have a PetroCan phone to use in the US if needed, that wasn't an issue for me. The only other con was that President's Choice advertises a $15 top up that lasts 30 days, and a $25 one that is good for 60 days. Petro Can has a $100 that lasts for 365 days.
Earlier today, though, I read in a digitalhome.ca thread that someone saw $100/365 day top-up cards at the Superstore. These are *not* mentioned on their website, but I just came back from some grocery shopping and, yes indeed, they are available. I'm not sure if the $100/365 option is available for automatic top-up or not, but I'm pretty sure they'll have these are Loblaws and Independent Grocers as well -- so very convenient.
So this may very well be the best deal for pay-as-you-go if you need more than 140 minutes per year (a $50 top up with PetroCan, less $15 for e911, at 25 cents per minute, gives you 140 minutes), and don't need to use the phone with a pre-PAID SIM when in the US.
Oh, and another thing I thought of. If I need to quickly leave a message for my wife, a 15 cent text message is the way to go. Calling will cost at least $0.45 (20 cents for me ant 25 for her).