I was maining a ThinkPad a few years back and wanted to switch to a beefy desktop. I went into Micro Center and, instead of doing my own build which I totally could have done in Micro Center also, bought a PowerSpec PC with a Ryzen for not much more money and considerable time savings, under the rubric that I could always upgrade it later.

I couldn't be happier. Their machines are pretty much white-box builds. Some of the cases are a little ricey but they are fairly easy to take the covers off of and the internals are nice to work with. The motherboard is a bit weak, but like I said, it can be upgraded, and it comes with enough power supply to support all but the most extreme loads. Not a bad starter choice if you want a new gaming or otherwise tweakable PC.