Look m8 as a pro with comps here is a tip:
If you are not able to open a PC yourself and install hardware and ram and graphics cards and know what goes where do not buy a PC from anyone but one of the big 5 PC brands i.e. HP, DELL, Philips, MAC, Acer - as although these nova ones are cheaper they have a major tendency to break and their customer support is crap - which is an issue you don't have to deal with if you go for one of the big three - reason I ask about ur tech skills is ultimately its better to build it from scratch and is cheaper - I run a 4GB Ram, Overclocked Extreme i7 Core PRocessor (3.7GHz - quad-core), Radeon 5400 HD 512 MB Graphics card and Extreme Z-tech surround system sound card.