FSX-hardware

Hi guys!
I have fsx deluxe edition and now i want to make my game a little bit more realistic so i found this things:

https://www.logitechg.com/en-gb/product/flight-sim-yoke-system

https://www.logitechg.com/en-gb/product/flight-sim-rudder-pedals

https://www.logitechg.com/en-gb/product/flight-sim-switch-panel

https://www.logitechg.com/en-gb/product/flight-sim-autopilot-multipanel

https://www.logitechg.com/en-gb/product/flight-sim-cockpit-radio-panel

Which one of these above is worth buying and which not?
I also wants you to ask what is EFIS and if is it worth buying?

Thanks for answers!