Digital BW, The Print

I've been using an Epson 870 printer with MIS VM inks and have been 
satisfied with it.  But I'm getting the itch to be able to print 
larger format pictures.

It sounds like the only serious options for me are an Epson 1270 
(refurb) or 1280, the Canon S9000, and the soon to be released Epson 
2200.  I'm trying to decide between them.

I expect that the printer will be dedicated to black and white 
printing.  

Even if the new 2200 turns out to be amazing, it still seems to me 
like a 1270/1280 with continous flow ink will be the the best 
solution.  

A new 1280 with continous flow system would probably turn out to cost 
almost as much as the Epson 2200 (which will retail for $699 and be 
available for a bit less).  The 2200 may turn out to make prints as 
good as the 1280  -- and may have inks that are a little more 
archival (not a huge concern for me yet) -- but the ink costs for the 
2200 will be almost an order of magnitude greater than the cost of 
the MIS VM inks.  The only reason I can see to choose the 2200 would 
be if I wanted b/w and color from the same printer.

The S9000 also apparently has prints as good as or better than those 
from the 1270/1280, and it's supposed to be much faster, too.  But 
there are no 3rd party quad/hex inksets available for it yet, and I 
wonder whether there ever will be.  The non-chipped cartridges are a 
small plus, but if I'm moving to a continuous flow system with the 
1270/80 then that pretty much takes the chipped cartridge problem out 
of the equation.  

I'm just curious what opinions you all have regarding which printer 
to get for b/w printing.  Has anybody used MIS ink successfully in a 
Canon S9000.  Are there reasons why you can or cannot use MIS inks, 
other than needing to have paper profiled properly?  Is there likely 
to be any advantage at all to Epson 2200 over 1270/80, if all I want 
to do is print b/w?

Oh, one last question, I guess:   the only advantages I can see to 
1280 over 1270 are borderless printing and 2880x720 instead of 
1440x720.  Are either of those worth paying for?

Thanks for any advice.

-- Herb