hello kopitedavo.... before you buy any component's google the required spec needed for the games you intend to run , as you are in Ireland i can recommend pc specialist over here in England and they do ship to Ireland.
They have built me 3 games rigs , go to the build my pc section and put in the parts you intend fitting and at the end you get a report of what you might have got wrong before you buy .
if you feel confident enough to do your own build thats ok but if you get it wrong and something goes bang its only the individual parts that are guarenteed and then of course you have to prove what caused it .
NOTE .... If you build your own make sure you remove the thin film of plastic from the top of the cpu and dont forget the thermal paste