What PC for gaming should I get?

I live in Ireland. I'm looking for a cheap but good PC for gaming (as most people) . I would require it to run games like BF4, Crisis, CoD, Minecraft etc…
I would see my price range being 500-700 euro maybe a bit higher.
I'm looking for something with quite some space and a good processor along with a solid graphics card, something that would not lag if I started running BF4 and recorded it with Camtasia Studio, because that's what I want, a good gaming PC to record gameplays to YouTube.