Advice for intel 6th and 7th gen processor choice

Hi everyone I'm new to all this so bear with me if I make mistakes. I'm currently running an Unraid server primarily running radarrr/sonarr/Plex etc usually the most it ever has to handle is 4 Plex streams and maybe some 'downloads' at the same time. Also will occasionally be used for transcoding using handbrake.

Currently I'm running an Intel i3-6100 which is a 2 core 4 thread cpu with a TDP of 51W. I live in the UK where electricity is exorbitant so I'm looking to upgrade to something more powerful while ideally not breaking the bank on electricity. Above I've listed the 4 main CPUs I've been considering and some of the relevant stats. Any advice/resources you can point me to are really needed. Thanks