I have a few suggestions (I'm suggesting these for the warm category, but some fall under C and I as well...). They are available at least in the U.S., not sure if any Canadians are doing the warm group? Also, some info conflicts between growers websites classifications for temps. and IOSPE, I'm using the IOSPE info here.
Den. loddigessi- Cold to Warm,
IOSPE PHOTOS
Aeranthes grandiflora-warm/hot, the spike might be too long...not sure, but I saw these growing when I went to Madagascar and they were awesome, and they bloom in very low light, also available in Canada!
IOSPE PHOTOS
Amsiella monticola-cool to warm growing, I've been seeing these guys at every show, really cute with big flowers
Ascocentrum auranticum-warm to hot, not entirely sure about size?
IOSPE PHOTOS
Ascocentrum pumilum-these guys are little! warm growing
IOSPE PHOTOS
Sarchochilus hartmanni, cool to hot growing
IOSPE PHOTOS, and it's available in Canada!