Garmin

Edge computers handle navigation and training in one unit and will talk to almost anything over ANT+ or Bluetooth. Rally pedals put a power meter somewhere you can move it between bikes in minutes rather than committing it to one crank.

Varia is the one riders are sceptical about until they try it, a rear light with radar built in that warns you about traffic coming up behind. Alongside those sit heart rate straps, speed and cadence sensors, and the mounts to hang it all off.