I would suggest you go for an Continuous Ink Supply System (CISS)... With proper large size Ink Tanks.
I have one at my home. Prints Black & White at 10-20 paise/ page.... Prints all color documents in under a rupee in any case. Costed me Rs. 6500.
I have reviewed it on Thinkdigit forums: Read my review with patience and decide well: *www.thinkdigit.com/forum/periphera...-mp287s-accessory-esyink-ink-tank-system.html
Just remember one thing: A Inkjet printer's ink will dry out on the head, if you don't print every 2-3 days. Print anything, just print once in a while...