Amd is cheaper because of the heat + i hate the average build quality. But yeah if you want a AMD machine you should stick with a ATi card aswell. works the best as far as i know. Also if you want a cheaper solution for intel cores you can buy a i5 core like the 3570/3570k its the same as a i7 3770/3770k though it doesn't have hyperthreading so you'll be only using physical cores.
Also to shorten the expenses even more you can try to build it yourself if you know how to do it.
1 final thing ... there is a currency issue. people here can try to find all the equipment in US webshops though the prices are allot lower than the european prices.