BTW, Dante: if the lighting in the original shot is replete with Tungsten lighting, I recommend leaving the White Balance untouched, with saturation as low as possible and contrast to low or "linear", and do your B&W processing from there.
I've found that the noise gets nasty when you try to do the opposite when converting to B&W; also, in Lightroom, you may want to turn the Luminance noise reduction low, but the Color noise reduction high -- this brings out a nice "grain" feel in B&W without "blotchiness".
Just my twopence. 🙂