Is this any good to run HA and setup

Help theres so many to pick from its so confusing,

Ive been running HA on a raspberry pie 3 booting on a HDD for a few months after getting miffed with using so many apps on the phone to change the lights, heating etc.
I bit the bullet and managed to setup sonoff, migrated zigbee stuff over to a flashed sonoff dongle P, LocalTuya and even set up and flashed a 433Mhz sonoff bridge.

What im asking is the pie is to slow and cant run many addons without freezing. I need a new HA server setup.

Theres so many Intel NUC i5s, i7s out there and im going demented on which one is ok or overpriced.

Ive got around £250 to spend on the server and storage.

Will it be a hair pulling experiance to migrate it over to an Intel NUC ( ive never worked with docker ) only the pie.