The Cuisinart DGB-850 is nearly identical to the DGB-900.
They have all of the same buttons and options, they brew the same volume, the bean hoppers are the same size, and they both come with thermal carafes and conical stainless steel burrs.
The DGB-850 falls lower solely because it’s a more outdated model, but I’d still get this over the DGB-900 if you can get a better price.