If you're more of an iPad person but you want to occasionally do laptop-style work, Logitech's Create Folio is ideal. Compatible with the 9.7-inch iPad Pro (AU$200) and the 12.9-inch iPad Pro (AU$230) it connects without Bluetooth and uses your iPad for power.
Logitech's MX Master 2S mouse (AU$150) can charge for a full day's use in 3 minutes and will track on virtually any surface, including glass. Plus, you can use it to move across three separate computers and copy and paste files from one computer to another.
Hold Microsoft's Surface Dial (AU$150) against the screen of your Surface and you have a rotary dial that lets you scroll, zoom and navigate, as well as use dedicated features and design tools in different Windows programs.
Upgrading from a MacBook to an iMac doesn't have to mean leaving the trackpad behind. If you're not much of a mouse person, the Magic Trackpad (in Silver for AU$179, or Space Grey for AU$215) is a good alternative for Apple fans.
The Wacom Intuos Pro (AU$499) is great for designers and creatives. It connects as an input device (for both Mac and PC) adding pressure-sensitive drawing and painting as well as serving as a touchpad.