Answer: I think that Emerald Isle is probably the plant you're seeing in your neighborhood. They will need to be trimmed to maintain a tall narrow appearance. Arborvitae will remain tall and narrow without pruning so you may want to reconsider these shrubs. If not, other cultivars inclue:
'Castlewellan Gold' - Plants 20 feet tall and 5 feet wide have yellow new growth. The foliage turns bronze in winter.
'Moncal' - (Emerald Isle TM) - Plants 25 feet tall and 8 feet wide have a dense habit and bright green foliage.
'Naylor's Blue' - A pyramidal cultivar with bluish foliage. The plant will be 35 feet tall and about 15 feet wide.
A final suggestion is the pyramidal growth habit of Clemson greenspire.
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