I had an st24 for many years, one of my favourite cars I've owned.
My only complaint was the steering felt light and kind of ruined the feel of the car but other than that it was well equipped, quick enough, sounded great and I just enjoyed owning it, look out for rusty arches and a recent mot with good service history, they can cost if you get a bad one that's been neglected.
Milieage no issue so long as it's been regularly serviced as I think it was chain driven also but not 100percent on that.

Good luck and show us what you get