Canon MG5420 vs MG6320 vs MX922
Look for the older MG6220 or MG8220 (has transparency scanning strip), because these printers have the 6th (gray) ink and BOTH front cassette and rear photo paper trays. Canon eliminated the rear paper tray on the newest models like the MG6320. If in the US, you can probably still find them on eBay and Amazon.
I have the MG6220 and am quite pleased with it. Will produce neutral black and white prints.