the series x is hard to get hold of, but top of the performance tree and takes discs as well.
that said, why not try a second-hand xbox one x? it's not too far behind in power terms and it will still play all the same games (albeit some of the very new games won't be in quite as high a resolution). i would imagine you'll get one a lot cheaper than a series x and it's a good way to test the water as to how much you'll actually use it. it's also a very good blu-ray player as well.