I agree with Dave, black can look good but can also be a pain to keep looking good, I've had a number of black cars in the past but not any more.
Also as egb rightly points out, you can lose shapes and contours on a black car as everything tends to blend together as one colour.
I also think the wheel style and size can make or break a cars styling, some alloys just look lost on a car if they're too small.
I've opted for the 18" on my R-Design and after popping down to see the car at my dealers a few days ago I'm glad I went with them.
Getting back to body colour, I always only had two colours in mind when considering my order, Rebel Blue or Ice White but also adding the dark tinted glass roof to the white option for contrast.
I was juggling these colours around in my head for days, and Googling loads of images, but finally decided on the Ice White, which I think carries the style of the V40, especially if you add the tinted glass roof, really well.
The contrast between the white body against the black roof and black body trim on the rest of car is just right.
Dont get me wrong, Rebel Blue is a wicked colour, but maybe a bit too bold for me.
Another reason, that actually made up my final decision for not picking Rebel is because, just before ordering I found that there where two others owned very very local to myself, both literally just around the corner, so I just thought, two's company, but three's a crowd, especially in a colour as distinctive as Rebel and all within spitting distance of each other.
It's a colour that deserves to stand out from the crowd.
Another option on styling, which I went for is the R-Design rear styling kit, which looks fantastic on any colour, if your budget allows I highly recommend you add this option.
I think choosing wheel size/style and body colour is probably the most difficult decision about buying a new car.
Good luck.