You can use virtually any GPU on the market, this CPU is quite powerful. As long as it is only a single GPU, of course (shame about that low quality PSU, though...)
"Fairly cheap" is now hard to find unless you aim for really weak GPUs, which are completely unsuitable for this nice CPU of yours. Due to cryptocurrency mining craze, many mid-range and affordable GPUs are now terribly overpriced or simply out of stock. At this point, your best bet is probably Nvidia 1060 6GB, almost a no-compromise card for 1080p resolution, if you can find one for a reasonable price. If you want to go lower than that, you will have to settle for 1050Ti 4GB, which will still be able to play most games at medium-high at 1080p with nice framerates. I'd also recommend Radeon RX570/580, but they are nowhere to be found.