I was experimenting with the NIK software Color Effex and Silver Effex Pro II (plus some Photoshop CS6) and I like the results.
Here is the original color image:
Here is the edited image in a low key rendition:
Here is another portrait with some totally different processing; More of a higher key rendition::
NIK software has many different B&W conversions. However, we must remember that Photoshop Elements 10 also has some rather nice B&W conversions...