The first upgrade I would recommend for your Eachine Wizard X220 is the camera. Everything else on the Wizard is at least half decent, but the camera is pretty poor. The other problem with the Wizard is that it has no method of battery monitoring. You could add vBat monitoring, if you have a Taranis, but what if you don't?
The RunCam Swift 2 solves two problems at once! You get a pretty great camera, and you get built in OSD with voltage monitoring, without any complicated wiring or configuration.