Digital BW, The Print

I am finally using up my oem inks with my 1280 and want to start 
using 3rd party pigment inks. With all the inksets I don't know which 
to choose. I want a color pigment inkset that will allow me to print 
a selenium-toned b/w image with good longevity. I was thinking of MIS 
inks but they have so many inksets I don't know which one to choose. 
The other was Gen4 which has good longevity and is well thought of 
but I don't know of anyone using them for selenium-toned b/w prints. 
Any help would be most appreciated thank you.

Tim