We converted our front parlor to our home office. It still serves as a parlor, but we put a desk and two small bookcases at one end of the room. Although the furniture is pretty, the desk and surrounding area are a mess, er, I mean they are filled with creative clutter.
Since the bookcases flank the desk, the woodwork is all hidden, but storage is the priority and there is plenty of original moldings throughout our home so we don't miss it. I would LOVE to have built-ins, but we can't do that ourselves and its not in the budget to do it otherwise. I look forward to seeing updates on the progress of your project. Having a home office is something that really makes me happy. In the past we had the desk and computer in both the kitchen and dining room, neither of which I liked. Now that DH and I work at home more often, I like it even more that its tucked away in the parlor. Good luck with your project!