Very out of the loop lately but I am looking to upgrade/build this year at Xmas 
Wondering if any of you knowledgeable people can confirm if this is any good or not - I will mostly be gaming may switch from 1080p to 1440p in future and maybe adding a second monitor.
My budget is not really a budget following items are being gifted to me for xmas
Intel Core i5 6600K Processor
Asus Z170 PRO Gaming Motherboard
Corsair Vengeance LPX 16 GB (2 x 8 GB) 3000 MHz DDR4
Cooler Master RR-212E-16PK-R1 Hyper 212 Evo Universal CPU Cooler
I will be buying the GPU - I really seem drawn to the AMD R9 390X 8GB are these cards good for 1080p possibly more? Not looking into SLI or anything as I dont think my PSU will be high enough rated by today's standards for that?
I am currently gaming on 60Hz 1080P monitor
One thing I am completely stuck on is what case to go for - I don't want to spend a fortune and to the best of my knowledge I cannot use my old one as its an MATX after inspecting.
There are so many options everywhere but ideally I don't want to spend more than 40 or 50 pound if I can help it.
Will be reusing a 1TB HDD and 128GB SSD from my old PC - May get a new SSD as well for games and use the 128 as system only.
PSU I currently have is a Cooler Master Silent Pro Modular 700W '80 Plus Bronze' Power Supply - Which was recommended to my from my last posts a few years ago here it has never gave me any issues so far and has happily ran with a HIS HD 7850 IceQ X 2048MB GDDR5.
So would the above choices plus the GPU coupled with everything I already have seem ample for the next few years?

Wondering if any of you knowledgeable people can confirm if this is any good or not - I will mostly be gaming may switch from 1080p to 1440p in future and maybe adding a second monitor.
My budget is not really a budget following items are being gifted to me for xmas
Intel Core i5 6600K Processor
Asus Z170 PRO Gaming Motherboard
Corsair Vengeance LPX 16 GB (2 x 8 GB) 3000 MHz DDR4
Cooler Master RR-212E-16PK-R1 Hyper 212 Evo Universal CPU Cooler
I will be buying the GPU - I really seem drawn to the AMD R9 390X 8GB are these cards good for 1080p possibly more? Not looking into SLI or anything as I dont think my PSU will be high enough rated by today's standards for that?
I am currently gaming on 60Hz 1080P monitor
One thing I am completely stuck on is what case to go for - I don't want to spend a fortune and to the best of my knowledge I cannot use my old one as its an MATX after inspecting.
There are so many options everywhere but ideally I don't want to spend more than 40 or 50 pound if I can help it.
Will be reusing a 1TB HDD and 128GB SSD from my old PC - May get a new SSD as well for games and use the 128 as system only.
PSU I currently have is a Cooler Master Silent Pro Modular 700W '80 Plus Bronze' Power Supply - Which was recommended to my from my last posts a few years ago here it has never gave me any issues so far and has happily ran with a HIS HD 7850 IceQ X 2048MB GDDR5.
So would the above choices plus the GPU coupled with everything I already have seem ample for the next few years?