Is everything okay here? + is there a cheaper PSU that can run this rig?

[JaanPsoky]

All parts: http://arvutitark.ee/est/tellimine/agly2mt3PJ

 

[n0ns3ns3]

yes, there are cheaper PSUs.
https://arvutitark.ee/est/tootekataloog/Arvutikomponendid-Toiteplokid-PSU36/PSU-Be-uiet-System-Power-8-400W-80-PLUS-194266
you'd be better with i3 based build. if you go for a mother board with 2 memory slots, you better be getting single 8GB module in order to have an option to upgrade later.