Hey, sancho1983, FWIW, here are my cards.
I chose a local printer who keeps them on file and restocks me for a cheaper price as long as the design remains the same. Good quality too. I like being local because getting to know the people in your city makes you known as well and this can lead to jobs. Point in fact, said printer gives me a discount when I mention that a given card design is for a client so that I can charge a markup without hiking the final price too much.
Two different fronts:
And this is the back:
This is a one-sided design that I have since phased out:
I chose photos that appealed to me. If you need advice I'd advise against asking for that here: not because the people here know nothing (many here know a lot), but because we photographers are critical as heck and self-critical as heck squared. Ask your spouse or a friend or someone who is NOT a photographer and who will look at pictures without immediately feeling -consciously or unconsciously- compelled to 'improve' and look for flaws and technical aspects.
No offence to anyone here, but I honestly don't give a flying trout what other photographers think about the images on my business cards (or the cards themselves for that matter). I liked them photos well enough to showcase them, and quite a number of my contacts have liked them or even loved them, and that means they've made an impression and they're more likely to be remembered than the generic camera/aperture blades/shiny logo other colleagues might use.