The keyboard I've used for longest was K860 (which still works fine after 3 years and which I still like, though it is rather wide), and as for future works I'd like something between the current two keyboards being Sofle Choc (rotary encoders next to QWERTY B/N) and Redox (thumb cluster layout) with a couple tweaks to allow for closer-angled placement of the halves.
However, no such keyboard seems to currently exist, so I'd have to either find the time to design and build one myself, or commission someone to do that for me.