>>938216776
You could, as an alterative, potentially wish for the money and time to build one. There are lots of resources online to make sure you get the correct parts and assemble them safely and properly.
Building one can help keep you costs over time lower as you can assemble a machine which doesn't become unusably obsolete in too short a period. That all depends on what you want your desktop to do. Pre-assembled machines can either be under specifications or simply overpriced.