If your Bach box is from the Brilliant label, I have that one too. There are so many works of his that are sublime. In many polls of classical music listeners and critics, his B minor mass is considered the single most important work. I would be inclined to agree. The only kind of work he did not undertake is opera. Complete works of composers like Beethoven, Mozart, and Schubert would also not contain any "dogs."
But, at any early stage of collecting, I would suggest surveying a wide range of composers and composition styles, including 20th and 21st century composers.
But, at any early stage of collecting, I would suggest surveying a wide range of composers and composition styles, including 20th and 21st century composers.