These are the best non-mechanicals you can get. IBM KB-8923 and HP C3758A. The HP one came with Vectra machines during the 90s (their business line of desktops back then). This one is based on Keytronics.

The KB-8923 feels great to type on and it’s built very well. Not a weapon like the Model M but definitely has a sizeable heft most keyboards (even new mechanical gaming ones) simply do not have.