Need help buying Gaming Computer!

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Right i want to buy a decent computer which is able to play high spec game or atleast run counter strike source extremley well. Price range is £0 - £600, must come with monitor, speakers, and ofcourse tower

i checked out www.pcworld.co.uk and found this one and i need a rating out of 10 or if its good or nnot.

Also it must have an PCI-E lot or APG whatever is better.

http://www.pcworld.co.uk/martprd/store/pcw_page.jsp?BV_SessionID=@@@@0150879596.1154292518@@@@&BV_EngineID=cceiaddiheglhgicflgceggdhhmdgmj.0&page=Product&sku=509720

The link above is the computer im going to buy unless you can find a better one than that!

Also i dont wanna custom computer buying parts sepretley just whole computer fixed up and sent straight to your house.

By the way i live in ENGLAND so look for england sites

Thanks alot