I'd say a prime seat is on the floor about 20 rows back. I've seen a few shows from here and would recommend highly.
I've also just shown up in Toronto or Phoenix, to get random seats, and had the best time ever. Seated off to right or left.
Even if you are way close up or upper tier on the right or left the show will go on. In short, whatever the venue, there is a certain common theme that is just beautiful.