Initial thoughts -- you're on a 773 for more than 13 hours each way. The current config is a lousy 2-3-2 with angled business class seats. Yes, the 777s are set to be given a cabin redo, but that is a) supposed to start this summer, b) with no schedule announced and c) nothing showing actual cabin mockups - just "it will be like the 350 product".
You have no assurance what kind of config you will get next year, nor whether or not it will get swapped out at any time.
Yes, it may be a "great deal" in terms of price. Is it one in terms of value received? One big thing to remember is that these are not "free flights" (which is what airlines want you to think). They are flights being purchased with an alternative currency that has value. And that you will no longer have that currency if you spend it on this flight. Will you have a better use for those Aeroplan points at another time?
Also, are those just AC points, or transferable ones that can be used in multiple programs (Amex, Chase etc)?
Further thought. Many carriers have not released schedules for your flight dates. Perhaps you should wait a bit.