In my opinion, an inkjet might be the best choice for you. Even though you think you do not need color, I would think you might want to put some color in some school report if you use charts or graphs in the report, or some color images to spice up the report if appropriate.
The basic laser printers start at a higher price, and, based on what I see on newegg.com, that starting point does generally not include color models.
Other forum members may have a different viewpoint on this, so they're welcome to comment.