Digital BW, The Print

We have been using in our studio several Epson printers for making
fine art prints on Fine Art, uncoated paper. All of them are of the
3.5 pl variety (R220, R2400, 3800 pro, 4800 pro). The inks used are 5
dilution of blacks (either MIS Eboni or Piezography) with no tone
control and the printers are driven by QTR. This inkset is very
similar to Paul Roark's Carbon-6 inkset.

We decided to move to a 24" wide printer. The size of the image will
be still 17" wide, but we want to be able to print on the fine art
paper sheets that are 22"x30" and leave some 2" or more of border
around the image.

We have found two lightly used printers for sale in Italy: a 7600 Pro
(around 1100 euro) and a 7800 Pro (around 1700 euro). I would like to
ask for an advice from this community between the two printers, as it
appears that many of you have experience with both printers. Here are
few points that might be of relevance for choosing the printer:

1) The 4800 Pro with 3.5 pl droplet size, 180 nozzles and AMC
technology makes breathtaking  prints on both coated and uncoated
papers. The Epson 7800 should make the exact same prints. We are worry
that the 7600, with 4 pl droplet size, 96 nozzles and no AMC, will
make lower quality prints.

2) We don't care about printing speed: given the long drying time of
Fine Art papers, we operate the printers with a long "Drying time
between head passes". We only make B&W prints: no color at all (would
use the 3800 for that).

3) The 7600 seems very reliable and easy to operate with
non-pressurized carts. Comments on the internet are extremely
positive: this printer seems to be a workhorse. Their cart seem  easy
to refill. We do not know about the 7800 with pressurized carts (are
the cart's chip resettable as for the 4800?).

4) Printer cost is somehow an issue: business is very slows this days.
We would go for a 7800 (costing 60% more that the 7600) only if print
quality from a 7600 is expected lower than the 7800.

Thank you very much for your advices.

Cheers,
  Daniela