Can someone recommend me a good budget 800-850w psu? Is there any priced around 70eur

Bagge6, if you mine in a place where noise is not a big issue, buy second hand HP server PSUS, which you can find on EBAY, they are cheap and kick ass.
Here is an example of a 1200W that can run fine at a load of 850 if that is what you need for your rig:

https://www.ebay.com/itm/HP-HSTNS-PD11-DPS-1200FB-1200W-Power-Supply-Ethereum-Mining-Crypto/174647489637?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20190920091355%26meid%3D4459d9a4fc064355909c8223b7220b06%26pid%3D100036%26rk%3D1%26rkt%3D12%26sd%3D353344116397%26itm%3D174647489637%26pmt%3D0%26noa%3D1%26pg%3D2047675%26algv%3DDefaultOrganic%26brand%3DHP&_trksid=p2047675.c100036.m2109

And the board with 12 cables that have 6+2 pins at the other end:
https://www.ebay.com/itm/DPS-1200FB-QB-A-12-ports-Power-Supply-Breakout-Board-Adapter-Cables-for-Mining/264275631650

Under load the fan will get a little louder than a regular gamer PSU so if you keep your miner in your living room or bedroom, it's not a good idea but if your miner is in a basement or garage or something, these server grade PSUs are the best bang for the buck.

Well priced too, good link. Thanks for sharing.

or just go to www.parallelminer.com and get everything in one kit!