Digital BW, The Print

What with new inkjet printer offerings from HP and Canon and eventual 
announcements of best yet-to-come from Epson, eBay will be flooded with 
9800s in about 6 months.  Could you get a better print, as compared to 
using a singe printer, if you printed the K of the CMYK on the Epson 
using a custom inkset then printed the color components on the new 12-
ink machines?  Could registration issues be resolved and can inksets be 
mix and matched?