Digital BW, The Print

Hi
I'm new to this group and am interested in printing B&W prints with 
my Canon S9000. I've had pretty good luck using the color inks to get 
a B&W print in greyscale, but wondering if the Lyson Quad Blacks 
would be that much better (aleviate the color casts). Can anyone 
offer some actual experince with these inks and printer? Also, I have 
yet to find a source in this country for the quad blacks for the 
printer. Also, which paper works best with this ink/printer combo. 
I'll appreciate any help anyone can give me. 
Sonja