Hi. We have some large leyland cypress trees that need to come down in the next couple of years. We have time to plan. They line our property and provide privacy screening (or used to, before they got huge). What would you recommend to replace? We're in zone 6. The soil has a fair amount of clay and the ground is pretty wet. We have room to build up a bed, though. We were thinking about a few green giants, but are worried they will be too tall. We were also thinking about some holly trees, but would want a variety that doesn't get too big.