I recently purchased Nik Software's Silver Efex Pro 2 after my free trial ran out. The software is expensive at $180 for a plug-in, but I have found that I can not come near its results on my own. I'm simply not too good at processing monochrome. Fortunately, I had an Amazon gift card balance that took care of most of the expense.
Many of you have this software already, but for those that don't, it's got great manual controls and also a good amount of presets included. I usually pick a preset I like and then tweak it with the manual controls if necessary. My favorite part is the "toning" section. Lots of control there, too, and great options like copper, sepia, coffee, selenium, etc.
Anyway, here are a few photos I've converted to monochrome using Silver Efex 2. Hope you like them and thanks very much for looking!
f/3.5, ISO 640
f/2, ISO 100
f/3.5, ISO 3200
f/2.5, ISO 100