First of all thanks Setsul for helping picking parts for my computer, it is now done and it runs perfectly.
So my friend has a prebuild 550 euros desktop that he wanted to upgrade, add a GTX 980 or a 1060 and a i5-6500 so he asked me what else does he need to upgrade if he wants to make those changes, scared of saying a complete lie i turn my head back to here hoping someone can help me and him.
Here are the "specs":
GPU: AMD Radeon R7 200 Series
CPU: AMD A10-5800K APU with Radeon(tm) HD Graphics
MOBO: ASRock FM2A78M-HD
HDD: 2 TB
Thanks in advance