I think you will be fine with any decent ram around 3200-3400mhz obviously the lower CAS rating the better, would say around C15 for 3200mhz is going to be ok, C16 for 3400mhz etc, Geil do some RGB stuff, G-Skill Trident Z comes in RGB too, you will pay more for RGB though.
Coolers, personal preference i think, im going AIO as it looks neater and tidy and the results are generally as good as the decent air coolers without adding all that weight on your mobo, personal choice on those would be NZXT Kraken 62, Evga 280 CLC, or at the cheaper end the ID-Cooling ones are superb for the money. For Air then Thermaltake, Noctua, Phantek or Cryorig coolers are all basically the better ones.
With regards to case, again personal choice, i think your current case is still decent, i have a Phanteks case and i can highly recommend them, but ive also had Corsair cases and they are superb and highly recommended as well.