Here, this would be my best build in this money
Kingston DDR3 HyperX Beast 2x4GB 1600MHz Cas9 85,90 € http://www.chiptec.net/componentes-para-computadores/memorias-ram/memorias-ddriii/memorias-ddr3-1600/kingston-ddr3-hyperx-beast-2x4gb-1600mhz-cas9.html?
Intel Core I3 4170 3.7GHz 3MB BOX 134,90 €
http://www.chiptec.net/componentes-para-computadores/processadores/intel-socket-1150/intel-core-i3-4170-3-7ghz-3mb-box.html
Gigabyte H97-HD3 Intel H97 SK1150 98,90 €
http://www.chiptec.net/componentes-para-computadores/motherboards/intel-socket-1150/gigabyte-h97-hd3-intel-h97-sk1150.html
Asus Radeon R9 270X DirectCU II TOP 2GB DDR5 PCI-E 207,90 €
http://www.chiptec.net/componentes-para-computadores/placas-graficas/placas-graficas-pci-e/asus-radeon-r9-270x-directcu-ii-top-2gb-ddr5-pci-e.html
Aerocool GT Advance Black Edition 29,90 €
http://www.chiptec.net/componentes-para-computadores/caixas-para-computadores/caixas-atx/aerocool-gt-advance-black-edition.html
Seagate Barracuda 1TB SATAIII 64MB (6GB/s) 57,90 € http://www.chiptec.net/componentes-para-computadores/armazenamento-interno/discos-rigidos-3-5-sata/seagate-barracuda-1tb-sataiii-64mb-6gb-s.html?
LG DVD+/-Rw 24x DLayer Sata Preto Bulk 16,90 €
http://www.chiptec.net/componentes-para-computadores/drives-opticas/gravadores-de-dvd/lg-dvd-rw-24x-dlayer-sata-preto-bulk.html
Seasonic S12II 520W 80PLUS Bronze 70,90 € http://www.chiptec.net/componentes-para-computadores/fontes/fontes-de-alimentacao/seasonic-s12ii-520w-80plus-bronze.html?
Total 703.2
If not we replace the videocard with Asus Radeon R7 260X OC 2GB DDR5 PCI-E 140,90 €
http://www.chiptec.net/componentes-para-computadores/placas-graficas/placas-graficas-pci-e/asus-radeon-r7-260x-oc-2gb-ddr5-pci-e.html
New total 636 euros.
I really really recommend the first build if not the second one is ok too.