Create the build in https://uk.pcpartpicker.com/ and it will verify the compatibility and generally show you the cheapest prices or thereabouts. Plus you can list other people's build using said parts to get an idea if they are a goer or not. At the end of the day you are trying to create a balanced system with no one bottleneck for the games you want to play. Monitor resolution and frame rate desired will have the biggest impact on the rest of the components - CPU, GPU and ram.