Need help choosing a pc

Hey guys,

Okay, so.. I have a budget of 750-800 euros - for my pc build. And I found this pc http://kompiuteriai.pcgames.lt/preke/kompiuteris-gamer3-class-b-core-i5-4570-32max-36-ghz-8-gb-1-tb-gtx-760-oc-2gb/ . What do you guys think? Should I contact someone who build them or should I buy pre-made one? And also I need a monitor so it would be nice if you could suggest me any cheap-gaming monitors for 50-100 eur.