I like the backlit RGB with lots of colors (at least 7 or 8, some with millions) and programmable with either internal software or user app that is on computer.
Zalman Z-machine Gaming Gear ZM-K900M
Rottay (no model #) --most beautiful design, nice to use.
Razer Cynosa Chroma
Above are wired only since the lighting takes current that will drain battery quickly. Have seen only one model backlit that was wireless.
Those are some of the ones I have used. Others I have are the original IBM mechanical key, Microsnot, Logitech, Saitek Eclipse, Dell Bluetooth, Gateway, GE long range wireless, EditorKeys for MS FSX, NEC Z1 infrared JoyAccess JA-CB2 for iMac, a few others.
Using computers since 1962, when only keyboard was on the punch card machine. Building, repairing and upgrading PC boxes for a few decades.