What Wez said, Scan, they can spec and ready build for you. Gfx for example https://www.scan.co.uk/products/2gb-gainward-gtx-950-pcie-30-%28x16%29-6610mhz-gddr5-gpu-1026mhz-boost-1190mhz-cores-768-dp-12-hdmi-20-d
is more than adequate to power your monitors, just check connectivity........ says in the spec of each gfx card what monitor connections it can handle. For the prices you were origiannly going to pay you could buy a third complete set of parts to hot swap if needed and still have change. Parts don't tend to go wrong as much as they used too as long as you buy the better brands like Gigabyte boards etc.