If you focus on the more tropical, warm growing ones, you don't have to worry about the fall cool-down (warm days and cool nights) that is very difficult to achieve in your climate.
If you have [U]lots[/U of greenhouse space, the hard-leaved tropical Cyms such as floribundum (pumilum), finlaysonianum, aloifolium and related species can make spectacular specimens. But these can really turn into beasts.
Cym dayanum is smaller, very floriferous. Cym canaliculatum is very nice, and actually NEEDS warmth - in winter, needs to be much drier.
Of the Chinese Cyms, ensifolium and sinense need to stay on the warm side (and are nice and small). Some of the other Chinese species need cool and may be tricky.
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