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Cheap is a moving target. The same money buys a different machine every few months as component pricing and the exchange rate shift, so the useful question is not which model is best this week but which compromises are safe to make and which ones you will pay for later.
Some parts are easy to improve once the machine is in the house. Others are structural: the case, the power supply and the socket the processor sits in decide what the machine can become, and swapping any of them means taking the build apart.