What hardware do you currently use and what software do you intend to run on the new machine? And what's your budget situation?

In any case, I would always recommend to buy used or refurbished hardware. Even if it's not necessary financially, it's better for the environment.

Would this mini pc be a good homeserver

For what purpose?

I have one of these, it's a decent mini PC. It's decently powerful - I used to play some steam games on it; a bit equivalent to steam deck or a bit more powerful. I used it for streaming on my home TV. I upgraded to a even better one as I liked it so much - and wanted to do more gaming.

It's a full PC basically. Whether it suits your purposes really depends on what you want to host? It could be overpowered and a bit redundant for a lot of self hosting uses.

I have a Raspberry Pi 5 which is cheaper than this, and am hosting docker with Home Assistant, Sync thing, and fresh RSS running on it at the moment with plenty of spare memory and cpu resource.

This mini PC is considerably more powerful and will have a higher power use at idle. You may struggle to use it at capacity so may be a bit wasteful?

And even the rasp pi 5 is over powered and expensive for a lit of common home server users.

So whether this PC is a good price and choice really depends on what you want to do with it. It's at the end of the spectrum of being able to comfortably play 4k video. So it'd likely be a decent Jellyfin streaming host if that's what you want?