Digital Printer suggestion needed for magazine

I have a small monthly magazine with a circulation of 6000 (minimum) copies having 52 pages including cover pages. It a magazine narrow size (8.125x10.875 inch).

I want to include some 4-8 color pages in each issue.

I want to have my own digital printing press so that i can work by myself. I hate relying on others because there is always some problem like price hike, slow work etc.

Can anyone suggest me a digital printer (4 or 6 color) that the ink (cartridge/toner) can be easily replace or refilled so as to avoid buying new cartridge every now and then. 'Cos, new branded cartridge/toner cost a lot for heavy duty and for future consumption.

My budget (expectation) is Rs. 5 lacs (11,159.48 USD) only.