Two weeks seems a little short for what you want to do. Here's why I say that: Chicago to Seattle, via the southern route you've chosen, is 2300 miles. That's about 5 or 6 days driving if you're trying to keep it to 400 miles per day. Yellowstone National Park, if you wish to see anything of it at all, is going to take you the better part of 3 days going for most of the day. OK, there's 8 days. Then your return is another 2200 miles -- 6 more days. No time for stopping anywhere.
IF you can get more time, I would go out via the Southern route, and return via the northern route. That will give places like Glacier time to get Going to the Sun Highway open. It doesn't traditionally open until around Memorial Day weekend, anyway.
But you really, really need more time unless all you want to do is drive through these places to say "I've been there" without really seeing anything of them.