I have now bought the M276nw printer, which is the wireless version of the M276n printer.
Please note the M276n is NOT wireless, contrary to how it is described in several places, inlcuding on Amazon. I ordered the printer, received it, unpacked it and spent some time trying to attach it to my network before I realised that I had been mis-sold a printer that was not wireless. Nor did the non-wireless printer come with the correct cable to attach it physically with the network other than a USB cable which is only intended for use during set-up.
All this said, otherwise the M276n and M276nw are the same printer and the print quality is excellent. For the money either printer produces excellent quality prints at full resolution and there is plenty of scope for printing in more economical modes. This is all easy to change, as is grayscale.
Scanning is also a breeze and produces good quality documents in a range or formats.
Just make sure you ignore the product descriptions on Amazon and get the printer you want - M276n for the standard networked printer (NOT WIRELESS) and M276nw (for the wireless version).