Digital BW, The Print

I know of two CIS systems for the R2400 that look interesting, efillink and inkrepublic; they 
are comparably priced.  Aside from MIS, are there others?

Both of these systems require some modification to the printer, more so, apparently, with the 
inkrepublic system.  Does this void the Epson warranty?

Since I'm interested in a CIS system that will accommodate Cone's Piezo inks, I'd like to tap 
into the experience of any users here.  Any and all comments most welcome.

Harry