I also print Greeting cards of my work, after making the investment in an inkjet printer with a CIS attached, to do so, I now think it would have been smarter to go with a color laser printer. HP and Minolta make very good printers and I have seen cards printed with these machines and the quality was very good. I think the start up costs would have been less, and the cost per card would have been less also. When my printer dies, a color laser will replace it.
This option is at least worth a look