ooh! I admit...I really like the second one...the image just pops!
may seem a bit dark for some...
but I think the colors of the background in the first one...are almost too distracting!
And I like the font better on the black card too!
Could you do a card like the second one...but with a solid light blue background?
That way you can choose to give out a lighter card for some clients, and the cool dark one for others!
I have done that in the past...given out two different cards, depending on the venue...
I am assuming that you are digitally printing these...otherwise two cards might cost a little too much!