This is exactly what I have....sassafras top, walnut sides. I went with the church style, which is a deeper body for more volume and better sound. It still isn't as loud as a full-sized dulcimer, but the sustain is really good for a small dulcimer. I really like my Clemmer Sweetie for travel and when I want a smaller dulcimer, sitting on the couch. IMHO, I think you would like it.
Here's a pictureof mine with the sassafras top: