We are building a large deck and I love the Landmark Castle Gate color (deeper grey)$$$. Our contractor used the Harvest Collection - Slate Gray$$(more brownish grey) in his design and estimate. I know the Landmark is new so therefor more costly but trying to figure out the approximate cost difference between the two. They deck will use about roughly 900 sq ft. of materials. So just trying to figure out how much of a cost difference.. are we talking 3k$ more $30K (just a ballpark number)... thanks for the advice.. I don't want to go over our budget too much.