Desperatly need Homelab/Hardware recommendations!

So, this open computer has been my homelab for a good while now, but I desperately want to upgrade it, so please recommend any hardware/upgrades.

Edit: I will use this server primarily as a media server! (shock) Edit2: I’m based in Norther Europe, so Amazon is not an option for me.

Current hardware: /What you see on the picture

Motherboard: B250M Performance
GPU: Nvidia GTX 1080 (defect, runs like an airport as soon as it needs to do ‘a heavier task’)
CPU: Intel® Core™ i5-7500 CPU @ 3.40GHz
CPU Cooler: Some cheap XILENCE fan
RAM: 16 GB
PSU: WPM600 Bronze
Case: Custom company (defo want to replace)
Storage: 1TB HDD + (2TB HDD but dead)

What I have to spare from previous build;