Hey the motherboard is not so important.Just videocard and the processor:
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Processor:AMD FX 6300 Hexa-Core Prozessor (3,5GHz, Socket AM3+ 14MB Cache, 95 Watt) 115€
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RAM:Corsair Vengeance Arbeitsspeicher (PC1600, 16GB, CL9) DDR3-RAM Kit 100€
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videocard:Asus NVIDIA GeForce GTX 660 Direct CU II Grafikkarte (PCIe 3.0, 2GB GDDR5 Speicher, DisplayPort) 200€
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Motherboard/Mainboard:GigaByte GA-970A-UD3 Motherboard Sockel AM3+ 4x DDR3 Speicher ATX 80€
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Intern Hdd:Western Digital WD10EZEX Blue 1TB interne Festplatte (8,9 cm (3,5 Zoll), SATA 6Gb/s, 64 MB Cache) 60€
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be quiet BN105 Pure Power 430W Netzteil 45€