An Intel Z77 motherboard, CPU Intel i7-3770k, GPU AMD Radeon HD7950, PSU Seasonic 750W, 8Gb of RAM, HDD of your choice, 500 GB and up, case Antec 300. Find a local reputable builder shop, preferably one run by gamers, they'd be happy to build that for you. It may cost some bucks more than from e-shops, but you'd get better service and good advice plus you'd keep the money in your hometown.