wferrante09 :
vMax :
The system is more than fine but I would change the Motherboard to a Z390 version so that you have the latest chipset in the Z390. You can find the Z390 motherboards at roughly the same price like and some lower with better VRM's like the Gigabyte ones but they will all do a good job:
MSI Z390 Gaming Edge
Gigabyte Aorus Z390 Elite
Asus Prime Z390-A
Gigabyte Z390 Aorus Pro
Your GPU in the RX480 is a bit weak but will be okay and you can look to upgrading that later to the new RX590 or any of the Nvidia range from the 1060 6GB upwards...
Quick question regarding my case. Will all these components fit with ease in a Phanteks P400 case?
And also, i was concerned about getting all of these new upgrades but then still getting lack luster performance due to graphics card. Is the graphics card going to affect much?
Yes they will all fit very easily into the P400 as to the second part, the issue is your GPU and you will not see much of a difference. Depending on what you are currently using, the GPU tends to be the single biggest difference to performance.
What CPU and motherboard and RAM do you currently have?