The Northgate was a great keyboard, and a company called Creative Vision Technologies briefly owned and sold keyboards under the "Avant" brand. I had one of those, it finally succumbed to some sort of electrical issues so I let it go. You can still by old Northgates and Avants on eBay, but ~$300 a pop.

No keyboard since has ever matched that level of responsiveness and tactile feel. The downside is just that it was so loud. Now that everything is open floorplans I wouldn't use one even if I still had one.