For around £140 I would be very satisfied. For anything close to £100 it’s a bargain!
that's what I was thinking. I did a new build a couple of months ago (3700x) so I have a main pc but was also thinking about a backup pc to replace the i7 920 i have. The motherboard on the i7 920 failed (second hand motherboards, not the cheaper boards from China, seem to go for around £100 on the bay) which is why I went for the new build which I'm very happy with. But I didn't like not having a backup in case I need it, which I did need a couple of months back.
3500x and Tomahawk max motherboard (unless there's a better value option?) and 16gb ram comes to around £260, which sounds like a very decent value for money build. GPU wise i have an r9 280 from my i7 920 build.