Izzy...
I used NIK Silver Efex Pro, here's the link
The Power of Black and White
I use it as a PS3 plugin Filter. A lot of folks says you can do everything in PS3 that you can do in the NIK program without the cost; that may be true, but it's much faster, much easier, doesn't require as a deep knowledge of PS and it has some features that you just can't get in PS, e.g., you can set up what amounts to a zone development feature, see what parts of the image fit into which zone, and amend them individually.
I do not work for NIK, or benefit from this endorsement,
Brian