Digital BW, The Print

I am currently use the 2200 but am considering to purchase one of the newer 
generation Epsons to be able to print glossy and mat without the need to switch ink 
cartridges and to use the advanced B&W driver.  I would opt for the 4000 if it wasn't for 
the cartridge switching issue (I am not interested in the "phatte black" imageprint option).  
Appart from the obvious differences in paper and cartridge size are there any differences 
in image quality between prints produced by these printers using the advanced B&W 
driver.  I have read that the 4000 is manufactured with a tighter degree of quality control 
and that each machine is individually calibrated.  Does this translate to superior B&W 
output in the real world?  Opinoins from members who have actually used both printers 
would be greatly appreciated.
Marc.