Digital BW, The Print

I am about to purchase my first inkjet printer.  I pretty much have 
settled on the Epson 1280.  I will mostly do black and white work.  
I am torn between using the MIS inks or the piezography system.  The 
MIS variable tone inks are interesting since you only have to buy a 
set and use one of the work flows provided on their site.  However 
the piezography system appears to have workflows for different 
papers worked out well.  However one has to purchase the software 
and if I want a cool or warm tone I have to purchase separate 
cartridge sets (I think). Please help, any suggestion or comment is 
welcome.

Joe