your lucky day. i just put something together for a friend. you can build 2 of those
european prices are crazy but meh

https://www.caseking.de/en/gigabyte-geforce-gtx-1070-oc-windforce-2x-8192-mb-gddr5-gcgb-145.html €444,90 * 8 - GPU
https://www.caseking.de/en/asrock-h110-pro-btc-intel-h110-mainboard-sockel-1151-mbar-251.html €134,90 * 1 - MOBO
https://www.caseking.de/en/intel-celeron-g3900-2-8-ghz-skylake-sockel-1151-boxed-hpit-317.html €34,90 * 1 - CPU
https://www.caseking.de/en/crucial-value-series-ddr4-2133-cl15-4-gb-mecc-108.html €39,90 * - 1 DDR
https://www.caseking.de/en/team-group-l5-lite-series-2-5-zoll-ssd-sata-6g-120-gb-sstg-038.html €52,90 * 1 - SSD
https://www.caseking.de/en/corsair-rmx-series-rmx1000-netzteil-1000-watt-necs-093.html €169,90 * 2 - PSU

win10 licence €5
8 * riser ~ €60
1 * add2psu ~ €10
frame ~ €30
€4266,6