> I recently bought a Dell Precision T1700, about 5 years old (EDIT: from 2013) for $199. Besides throwing in a better video card to run my 4k monitors, I haven't hit a point where I wished I had bought a better machine.
IMO, the new Mac Mini is a pretty killer deal for that use case.
At $600, you get a modern CPU that:
* sips electricity
* is whisper quiet
* supports 2 4k monitors
* comes with a pretty good SSD
The price is pretty close to what you paid if you need to install a graphics card and an SSD (although to be fair you'd probably get a lot more capacity with a 3rd party device), and the modern CPU gives it a lot more longevity than a 10 year old machine.
Of course, a potential downside is that you have to run MacOS. But I've found that it isn't that bad.