Hello! I need to hook up a 4k monitor to my iMac 5k 2017. The monitor has DisplayPort, Mini DisplayPort and HDMI. The iMac has Tb3 USB-C. My understanding is that there is no OEM adapter and Apple recommends the Moshi USB-C to DisplayPort Cable that they sell for whopping $50. Is that the right cable? If so, does anyone have any experience with it? Is it good for that price?