The upper levels are a great way to catch the Senators live for cheap. I have been to many games and I don't recall ever having to shell out more than $50 for a ticket in the upper levels although that changes during the playoffs.
I sat in 312 for the Habs game last year. I'm a big Habs fan although I don't always show my colors when I go to Scotiabank. The view isn't nearly as bad as you think it is. The photos do it no justice. I can still hear the scratches of the skates against the ice and the viciousness of each body check against the glass. It's better up here if you ask me. You won't feel disconnected to the game at all. GO SENS!!!