Les is right about the gold toner. I think selenium gives a slightly warm purple brown color I don't personally like. I have gone on a Quixotic Quest for the perfect cold tone combination. I lament the loss of certain papers over the years, but currently I think Kodak Polykmax Fine Art has one of the coldest blacks. I used to use a lot of Oriental Seagull G, but don't know what that emulsion is like these days.
So here's my suggestion: Kodak Polymax for paper. For developer, a home brew version of Ansco 120 (I think?), eliminating the potassium bromide (which also lends to greenish tones), and substituting benzotriazole as the restrainer. The 120 is Metol only, and I find that hydroquinone gives a bit of a greenish cast on most modern papers. Certainly it is the contrast-driver of your standard developers like Dektol, but you can just up the contrast filter to compensate. Make sure you develop for at least three minutes - incomplete development of b&w papers gives greenish or brownish tones. Maybe even more, as the Metol is low energy. Then fix in a non-hardening fixer, like PFormulary's. Finally, use a gold toner like Nelson Gold Toner, or I think PF sells one too just like it. Again, you will need to tone a fairly long time to get the lovely blueish cast to the print.
I realize this seems laborious, but it has worked for me. You have to dry the print, mount it, live with it awhile, and then go back into the darkroom to fine tune, but it's worth the effort.