Digital BW, The Print

What is the most practical wide format printer to use as a nucleus
for a fine art printing business?  I would like to be able to print
both monochrome and color with high enough quality for galleries and
fair speed.  From my reseach so far it appears that the HP DesignJet
5500 is the best all round compromise.  Epsons are too slow, limited
to their proprietary pigment inks etc.  The Ixia Iris appears very
expensive and somewhat fussy.  Any demand for this service or should
I just plan to use for my own print sales?  Ideas?