After buying multiple helmets, the best most versatile all around helmet was a flip-up helmet. It allows me to don the thing without taking off my glasses. Also nice to just have the face open in town. Since you're just starting out, just buy a cheap one, and then start looking for the perfect one. The cheep one will be your loaner/passenger helmet.
I ended up using a 3/4 open face helmet, with the flip helmet available for cold weather and rain.