Ask yourself if you want to take advantage of the "double-your-minutes" promotion going on right now. As you've stated that you wouldn't be using that many minutes, it may not be the case. However, I'd like to mention it since it's a good deal at the moment and you might want it for the future. Another thing to look at is free incoming calling. Without the feature, you'd be paying for every call you receive.
Regarding unlimited text messaging, you're going to want to sign up for one of the SPARK bundles, listed here:
products & services / SPARK / how do I get SPARK? / add a SPARK bundle - TELUS Mobility - Alberta
As you can see, the SPARK 15 bundle and above include what you need.
Good luck!