you cant sync mystic(msi) lighting and Logitech lighting(lightsync)
however, using an app called aurora you can combine razer, corsair, and logitech rgb settings.
https://www.amazon.com/Corsair-CH-9000234-WW-Double-shot-Keycaps-105-Keyset/dp/B075QMJGYC/ref=sr_1_2?ie=UTF8&qid=1532015794&sr=8-2&keywords=corsair+keycaps
it is a full set but you can replace your spacebar and everything else with high quality, pbt keycaps. Im pretty sure the k65 default comes with abs keycaps
I know from experience that fps games like overwatch are much, much better with 240hz panels like this one(I have it): https://www.amazon.com/Alienware-25-Gaming-Monitor-AW2518Hf/dp/B0733YCKM5/ref=sr_1_1?s=electronics&ie=UTF8&qid=1531881253&sr=1-1&keywords=Alienware+25
the arctis 5 has surround sound but the sound is actual cancer with it
honestly im gn2 in csgo and i dont need surround sound, i can hear footsteps well without it
I would go with the HyperX Cloud 2 or the steelseries arctis five, which has a lit mic, and it is the headset that i use!
or if your ears are big then go with the corsair voids or hs50s
this one's really expensive but the usb ports light up and the logo. don't recommend tho
https://www.corsair.com/us/en/Categories/Products/Cases/Software-Control-and-Monitoring-Cases/Obsidian-Series-1000D-Super-Tower-Case/p/CC-9011148-WW