I would say that mind is fundamental. I think in a basic sense, all that we experience is mind or transformations of consciousness. For example, a scientist will tell us that light is composed of photons vibrating at a certain wavelength, and when they strike the sensors in the eye, which generates signals to the brain, which conjures up an image of a red rose. But that is just a set of concepts that we have learned. What we actually experience is the visual sensation of red and green and various colors in between (as a part of a larger field of flowing, shimmering colors, I would add--- but we focus on some of these colors and apply the label "rose."). Only sentient beings experience the redness of red or the heat of fire. Without sentient beings, there would be no color, sound, touch, taste or smell. And we never experience photons bouncing off the eye for instance, or electric signals humming in our brain. We experience RED.
So are these qualities mental? I would say so. The quality of waking experience and the quality of dream experience is the same. Both are composed of colors, sounds, etc. Thoughts are similar, too. Not only this, must experience changes form mind to mind. Two beings looking at the same rose will have two different experiences. One may think the rose is beautiful, while another might be bored. A beetle might see it as food, while another bug might see it as a house. It will be huge to tiny creatures and tiny to huge creatures. While It is supposedly the same rose, it has no enduring essence. The difference must be based on the different minds.
Is there anything beyond these qualities or appearances? That is at best unknown. Modern materialists suggest that something outside the mind, and independent of the mind, gives rise to the mind. But this lies on a network of concepts and assumptions that can never be proven. We cannot step outside of the mind to see how things are independently of the mind--- this is a flat contradiction. Further, the idea of matter is based on inference, and inferences are always open to falsification. In fact, scientists who used to believe that matter was solid and enduring because it was composed of indestructible atoms soon learned that this was not the case at all. In fact, the idea of some sort of enduring matter may be another form of selfing.