"louoates" an excellent point: You and the designer have to work together as a team and the card, letterhead /stationary, ad and web design all must work together demonstrating to a client in not so subliminal ways about who you are, your level of quality, your attention to detail (like readability) and your values.
Zachary's card seems pretty high end to me. As best I can tell from the photo, it is well designed and produced. I think the extra tactile element is very nice. I think it conveys a sense of quality very well. And, if your clients are primarily involved with design in some way, I think they will respond very well to a card that emphasizes both high-quality design and high production values.