CPU Cooler: It's cheaper and performs better and quieter
Motherboard: Cheaper, but still good quality
RAM: Just plain on cheaper even within the same series
SSD: A SSD
HDD: WD Black isn't worth that extra $30 especially now that you got a SSD
GPU: Cheaper and again, does the same job.
Case: Just a different one that will fit the GPU better, but there are plenty other out there that will also fit the GPU, keep looking if you don't like this one. This one also has black or grey version
PSU: Cheaper, enough wattage for single GPU and still high quality