The Belmont is definitely my favourite diner in town. I'm not certain that it's the absolute best meal I've had in a diner in Calgary but, I can vouch for its' consistency and all-around goodness. I've been there now countless times, under countless circumstances and I never leave unsatisfied.
My most recent visit came during a brief stint working the graveyard shift. I stumbled in on my way home one day just after they opened to feast on a pancake breakfast and some bottomless coffee. The effects of the butter, bacon, syrup and caffeine all culminated into a strong sense of euphoria. It was probably from my lack of sleep but, still pretty great in any case. I'm glad that I can go there and not feel ridiculous for mumbling incoherently and grinning at my eggs after they've turned green from mixing with the blueberries in my pancakes.
If you decide to check this place out for yourself I would recommend that you do like me and try to avoid the weekend traffic. Also, never order the sausage for a side (it's usually dry and just really lame). Other than that I feel that everything there is a pretty safe bet.