Digital BW, The Print

I have an Epson 2400 and an Epson 2200, and have decided I would like
to try a monochrome inkset in the 2200.  Previous experience: 
currently own both QTR and IJC.  About a year ago I used my Eye-One
Pro to make a profile for Epson Velvet Fine Art for QTR on the Epson
2200 (UC inks).  Also made one profile for IJC as an experiment, can't
remember which paper.  Used QTR ICC-create to build a profile for the
ABW mode on Epson 2400.  Fairly happy with the results, but would like
to see how much better (if any) monochrome inkset prints would look to me.

In spite of all my reading on this list, I haven't figured out what
inkset would be best for me to try.  Don't plan to print sepia, would
use subtle toning if not printing a straight neutral print.

Possible choices: Cone K7, MIS K4+, or ?

Any suggestions appreciated.

--John