Just ordered the new 27" iMac. Upgrading from a Late 2012 model and this will be my first USB-C product. Does anyone know if I can just order some USB-C to HDMI cables to hook up two external 4K monitors? Or do I really need apples AV adapter (or another type of adapter)? I don't plan on paying a premium for USB-C monitors. Likely will find some with traditional HDMI. Thanks for the help!