Kat, What are you looking to accomplish with the tree? Privacy screen? Windbreak? Or just an ornamental in your landscaping? Depending on your answer, you may be looking at something like Arborvitae, or even a fastigiate (columnar-growing) conifer such as a spruce or pine, ie: Picea pungens 'Fastigiata', which has a nice bluish tint. Please also specify if you have a color preference. I am sure there will lots of other suggestions flying your way! ;-)