I've always enjoyed collecting distinctive business cards. Now that the world is all electronic, you see fewer of them. Still, sometimes when I walk into a sales presentation, my card is the only advertising I take. It's powerful.
I believe in "psychological comfort." You really have to feel good about your sales and marketing materials. If you don't love them, why should prospective clients be impressed. Simplicity is a key in good design. We designed my card 30 years ago, and it still functions perfectly now.
Vistaprint is the best place I've found to buy high-quality cards fast, and you can design them online.
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