Digital BW, The Print

Hi,
I am interested in moving to a CIS BW inkset for my Epson 1280.  I 
have been looking at MIS UT vs Pezio.  The MIS UT with 4oz bottles
(full) and the CIS cart is $215 (with free published curves).  The 
Pezio setup (for similar) is closer to $750.  Am I missing 
something?  Can someone help me understand why I would pay $500 more 
for the Pezio?  And on the rare occasion I want to print color from 
the 1280 is it realistic (with a cleaning cart) to switch back and 
forth color carts to BW CIS?

Thanks in advance
Brian