Well done Mick, by all accounts it's a cracking printer. I'm after a 3880 at some point - hopefully next year.
As to ciss i think only the permajet here in the uk doesn't effect the warranty - or they supply their own.
I currently have a 2100, purchased from fotospeed on ebay and their own ciss buggered the printer. I spent a week cleaning the heads etc. Then i got some empty refillable cartridges and the genuine larger 110/220ml cartridges from the various large format printers that use the same ink set as the 2100. Then i syphon off from the larger ones into the refillable cartridges. So i have effectively refillable genuine epson cartridges.
An empty ciss system with the above method would also be an option.