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I obsessed over my black and white conversions for YEARS. I tried virtually everything and finally settled on NIK Silver Efex Pro.
One of the first things I noticed with your photo is that it is underexposed. If you shot this using available light, you need make a decision...expose for your subject? expose for your background? or use evaluative metering and take all of the scene into consideration.
Personally, I use spot metering and expose for the subject and let the tones of the rest of the scene fall wherever.
I think that is why your conversion looks so muddy and murky.
On a different note, I found that NIK's out of the box conversions really sucked. It took me a long time to develop presets that are to my liking. Here are my thoughts: http://www.fredmiranda.com/forum/topic/1070286/0?keyword=nik,silver,efex#10180535