Typically, the best CPU available is going to be an Intel Core i5, however, if a budget PC has this processor, there should be the expectation that other components will suffer as a result of the higher-end CPU.

With a low-cost PC, it is important to maintain proper expectations. This PC will not run top-of-the-line games on high settings. Games will need to be run on medium to low settings depending on the game, and upgrading will need to happen down the line to maintain the PC's ability to run games as the industry progresses and games get more intensive on these components.