Digital BW, The Print

Like many before me, I've a new R2400 and am wondering what to do with
my older 2100/2200.  Although the R2400 is a good B&W machine, again
like many before me, I am tempted to turn the 2100/2200 into a
dedicated B&W printer.  

The Cone (neutral) inks do seem a lot more expensive than the UT7. 
What do you get for your money?  From trawling this forum, it seems to
me that:
* Cone is smoother;
* More recently versions of Cone may clog a little less, but reports
vary greatly.

However:
* Cone won't print on glossy;
* UT7 gives you toning options in one inkset;
* Lightfastness is about the same.

Are there any other variables that I'm missing?

F_P