Spec me please

[errat1c]

Hey guys, im new but wondered around the forum about 4 years ago and im now back. Im looking to build a new computer, mainly for gaming. i would like to play some of the new games that are out/coming out. I dont have a massive budget only around 600pounds at the moment. keyboard, mouse are not needed though. thanks in advance. Its been 4 years since i last built one myself. Many thanks

 

[errat1c]

Cheers guys, i have already got a monitor. not the best its an old dell one, does monitor make a big difference or is it just for the resolution? Also i will stick to old operating system (XP) should have added this last night my apologies.