Can't decide on a PSU
Here. I went with 650W from EVGA which is great PSU for the money. Try to convince your friend to pay a bit 50€ more to add a SSD, which will speed up his PC.
PCPartPicker part list / Price breakdown by merchant
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($175.88 @ OutletPC)
Motherboard: ASRock H97M Anniversary Micro ATX LGA1150 Motherboard ($51.98 @ Newegg)
Memory: Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600 Memory ($38.99 @ Amazon)
Storage: Kingston HyperX Fury 120GB 2.5" Solid State Drive ($54.99 @ Amazon)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.88 @ OutletPC)
Video Card: MSI GeForce GTX 950 2GB Video Card ($144.99 @ Newegg)
Case: Fractal Design Core 1300 MicroATX Mini Tower Case ($48.99 @ SuperBiiz)
Power Supply: EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($64.99 @ NCIX US)
Total: $630.69
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-04 05:39 EDT-0400