Best Digital Printer For Thick Card Stock (400 GSM)

Need some advice which printer can easily with least amount of headache print thick card stock duplex? We have been using an Oki C911 and hand loading paper but looking for something more automated. We have been using 18 point 12x19" C1S coated card stock.
Someone had mentioned to me Xerox Versant Copiers but they seem to list 350 GSM which is 16 point? We have been using a C6000 to print books as well using a perfect binder and have been Minolta fans for 20+ years. I prefer buying used or refurbished and have never bought a printer new.