Actually, it IS the PC gaming subforum, Mr Kagouris.
But you're welcome just the same, Galaxtix.
As others have said, keep your Xbox One. Continue enjoying it until you save up what you need to get a proper gaming computer. Only AFTER you have the computer, and can make the comparison for yourself, should you decide to sell your console. You can always then use that extra money to upgrade your computer further. There is almost never an absence of things to upgrade on a computer. James Mason's estimates are correct, though personally I'd budget slightly more for both categories ("somewhat noticeable improvement" and "be blown away").