mine cost about ?500 check my profile for details about it, msot of it is there, except i got it with 4GB of RAM and not 8
My best advice is to build, you learn a lot about a computer that you didn't before, howeve ri recomend doing your research first etc. Also build but an excel sheet containing all the parts with links and prices etc.
If i was going to build you a new PC i'd do the following:
Case:
Either go for a full tower or mid tower case, this will allow for the best motherboards and leave you with enough room for extra CD slots and HDD/SSD examples of good cases are:
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Link
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Link
Motherboads:
Going for ATX or extended ATX will get you the most power and speed and ease of use, also there are two types of motherboards AMD or intel these differences relate only to what type of CPU you want i list only AMD motherboards because that's what i use, but don't hesitate to look at intel ones either, good examples of AMD are:
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Link I have this one personnally and it is GREAT, works well for the price and has everything you will need for the next 5 years, however the obe below is a extended ATX and will probs last you longer techno side.
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Link
Processors/CPU:
These are the brains of the computer, the higher the ghz and more cores it has combined the better it is basically but you can ask one of these guys on here what will be best once you narrow down your selection, again you can get AMD or intel CPU's which will
ONLY fit in their respective motherboards.
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Link I use this, it is very good and will serve you well
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Link 2 extra cores than the previous one, which makes it a bit more powerful.
GPU/Graphics Card:
Helps you see shit better, the two main grpahics cards you can get are either ATI or Nvidia 1-1.5 GB cards will do you well. good examples are:
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Link ATI card
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Link Nvidea card
PSU/power supply:
To run a power draining system like with some of the items about i recomend a 500-600W PSU, although again you mgiht want to double check with people on here because PSU's arn't my area. Good examples are:
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Link
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Link
Basically that will give you yor basics for a Desktop, except for RAM/Memory but that is all relient on your motherboard etc just get 6GB or mroe and you'll be fine. Sound cards arn't really needed unless you're a sound NERD, i use my built in one and it works with my surround sound fine with good quality!
I am sure you could get better deals than the ones i listed however min are just an outline with some examples. Please psor here for more questions etc.
As you building or buying.... I would defo build again but if i had a lot of money i would buy it. It is cheaper to either build a new computer or find and old used one on Ebay/amazon or whatever and upgrade it and maybe replace the motherboard and CPU. However i will say this, it is cheaper to build your own if it's a higher end machine, however if your trying to build a cheap office computer buy it. afaik that's how it works.