I wore a waist-length veil and LOVED it. I cannot imagine not wearing one.
With that said...I worked in a bridal salon for a while and many brides did not want one...until we told them, "Just try it"...most of them ended up with a veil because they felt more like a bride with one on. It is, however, a personal decision.
Maybe borrow one from a friend and get your hair done with it on, then try on your dress and see what you think. Trying one out "for real" with your hair done and your dress may give you a very definite answer.