Good call, I occasionally forget how much Acme was inspired by Oberon. As for mice, I am currently using a Logitech 3-button "MouseMan" mouse via a PS/2 to USB

Good call, I occasionally forget how much Acme was inspired by Oberon. As for mice, I am currently using a Logitech 3-button "MouseMan" mouse via a PS/2 to USB converter, but if you want something more modern I find the Kensington Expert Mouse trackball an acceptable alternative.