Every plan has access to as much data as you want if you're willing to pay for it. Koodo doesn't cut you off when you reach your allotment. Instead you'll pay your plans overage rate.
Also there are some prepaid options. Prepaid is attractive because the data you buy rolls over each month until you've used it up. And then you can just buy more. Prepaid plans start at 15$ for text only. Check it out.