Don't really know but I've used quite a bit and not purchased a new cartridge . My Lexmark before seemed to use more and I can buy thus cartridge at rite aid/cvs/ or Walgreens but could not do so with Lexmark
I think it's the envy 5530. Got one for my grandfather got my mum the envy 4500 Bigger display a bit faster no fax though. Lots if cool web apps and forms
I'm sure you could print checks. I doubt magnetic ink is available though. I would recommend a laser printer for checks. I never purchase magnetic toner.
The HP Officejet 6500 series supports the Microsoft Windows 2000, Windows XP, Windows XP x64, Windows Vista, Windows 7 operating systems, does not have the HP ePrint technology that is needed to print from mobile devices like tablets.