If you were business and needed to stay small, we might not tell you to use a custom CMS. In fact, we might be cautious of recommending any proprietary systems, including a system designed specifically for one website.
We would, instead, recommend moving that budget towards differentiating yourself on style and computer programme selling. The overwhelming majority of the sites on the web nowadays would constitute this cluster. They wouldn’t like to extend their websites any further than practicality, than an easy journal or page management system like WordPress or Dhrupal offers.