As no one has responded yet, this is my view.
I wouldn't buy an MFD but would stick to "separates".
If one thing goes wrong it all goes wrong.
Remember the old "all in one Hi-Fi units"?
I have two friends who bought a Xerox all in one unit. Both of them have now said that the "copy" part and the "print" part does not work anymore.
A separate printer and scanner are far better at doing their respective jobs than an all in one.
I have an Epson R220 printer (two in fact) and an Epson 3170 Photo scanner. Compatible ink for the printer very cheap from many suppliers. I am quite pleased that I have a CISS system running on both these printers. (saves me a fortune). The scanner is able to scan documents/photo's plus it can also scan film negatives and slides.
Epson R220: click here
The 3170 scanner I have has now been superceded by the Epson 3940: click here
Compatible Ink: click here