PC for AV art installation

Hi - I am part of an audio visual art piece where we need a mini PC to be installed and running Ableton Live for 48 hours.

We need something that is reliable and robust, with a decent ram/processor to run audio production software. It doesn't need a hardrive bigger than 128gb, and graphics performance is not necessary as it will be operated remotely over network.

Do you have suggestions of parts that would work for this or even something pre-made that would fit these criteria?

budget of £200-300

Thanks!