Finally, I bought CPU, MB, PSU, CASE: about €226 (or $267 or £203).
€83,17 --> AMD APU A10-7800 (7th Generation), 65W/45W, Socket FM2+, 28nm, Steamroller/Kaveri
€47,67 --> ASROCK FM2A88M Pro3+
€66,74 --> SuperFlower 450W 80+ Platinum SF-450P14PE
€28 --> Sharkoon VG4-S
Re-used: HDD, RAM, CD/DVD drive, mouse, keyboard, monitor, .
Added my system to system specs in my profile.