Hi' I searched for some devices, But not an expert, but I can give a few ideas for you.
Your budget may not be enough to meet all your needs. You have to compromise on some aspects.
You can go with something like,
Corsair K100 RGB Optical (The best gaming keyboard)
Switch: Corsair OPX
Size: Full size
Backlights: RGB
Passthroughs: USB
Media Controls: Dedicated
Wristrest: Detachable
Keycaps: PBT double-shot
Mountain Everest Max ( The best modular gaming keyboard)
Switch: Cherry MX Red, Blue, Brown, Silver
Size: Full size or TKL
Backlight: Per-key RGB
Passthrough: USB 3.2 Gen1
Media controls: Dedicated unit
Wristrest: Magnetic, plush
Keycaps: ABS
Razer Cynosa Chroma(The best membrane gaming keyboard)
Interface: Wired USB
Keyboard backlighting: Per-key RGB
Programmable keys: All
Features: Per key RGB lighting, supports Windows 7+ and OSX 10.8+
