Very generally speaking...HP is usually easy to use with FreeBSD, there will be Linux PPD drivers that will work with FreeBSD. They charge a great deal for their toners. You might be able to find generic ones that work--HP keeps trying to stop that but as far as I know it can still be done.
Brother is also going to be a decent choice. Again, they usually have Linux drivers that can be used with FreeBSD. I think their toners are less expensive too. I don't know if generic ones are available or not.