* A fair bit more grunty than a Pi
* Fairly power efficient
* x86
* More of a standard computer
You should consider picking up what Servethehome has coined the TinyMiniMicro nodes. They're the kind of computers you typically find strapped to the back of a monitor in a doctors office and usually are fairly power efficient machines. I, for example, have a Lenovo m710q - which has an Intel 6500t (a quad core CPU), 16gb of ram, and a 512GB SSD, which I paid around 200USD for, that is significantly easier to manage than a Pi (since it's 'just' a computer) and sucks back around 10w of power at idle (which is roughly triple a Single Pi 4) - but still in the realm of negligible. It actually replaced a Pi 4 for my self hosted home stuff, and it was a fantastic choice that I do not regret.
Lots of this type of computer are available in all sorts of configurations, and the more 'standard' nature of the machine opens up a lot of possibilities the Pi either makes more difficult, or impossible. For example, my node hosts a bunch of services for me, but it also acts as a Steam In Home Streaming machine that I have connected to my living room television, which allows me to stream games from my desktop to the TV fairly effortlessly.