I would recommend the AMD one. I could list a computer build for you for $700 if you'd like using custom parts. However if you really feel comfortable using that website and that the parts used are of good quality, then you might want to purchase something like this:
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If you feel comfortable building a PC, please quote me. You will save money and get better components.
Please remember not to choose a H series motherboard, as they don't support overclocking. (Intel)