I'm looking to build a gaming PC which will be used primarily for gaming.
My budget is £700 including everything except keyboard, mouse and OS (so including monitor). I was thinking about an i5 3570k ( £162 off Amazon), an ARIAnet HD7870 (£174), a Hitachi Deskstar 1TB Hard Drive SATAII 7200rpm 32MB Cache (£52) and 8GB Patriot G2 PGD38G1600ELK (£37). But for the rest any help would be greatly appriciated! (By the way this is my first build)
Sorry forgot to add that i will be doing some light overclocking and would like to have the option of Xfire/SLI but is not necessary.
Your budget will make this hard to do. The builds listed are good but they do not include a Case and if I read your post right you want a monitor as well.
If you can do without the monitor we can work with the above build and tweak it to add a decent case. Since this is a budget build I would presume you are going to be gaming at a max of around 1080 resolution. With that in mind I would drop the video card to the GTX 660ti. The 660ti and the 670 are identical except for memory bandwidth and at 1080 you do not push enough data to really see the difference.
This should save you enough to add a decent case to this build.
If we do need a monitor then two stay in this budget we need to look at alternatives, possibly going the AMD router with a quad core FX or a quad core APU. Would could pull back on the video some more without hurting the gaming experience too much, down to a GTX 660 or an HD 7850, both of which give a great 1080 gaming experience.