I posted this in conifer forum & thought I would try here also. I have an deciduous forest environment, shade with dappled light in summer, full sun in winter on a northeastern facing slope. I am in southeastern Pa. zone 6-7. I want to plant a tall growing evergreen that will eventually reach 30+ft preferably taller. After studying a few arboretums I am considering Canadian or Eastern Hemlock, Leyland Cypress, Balsam Fir, Alaskan or Japanese Cedar, Oriental Spruce or even American Holly. Am I on the right track? Can anyone tell me which evergreen will grow the tallest fastest in this difficult sunlight environment?