I just built a new system using the GTX 970 and I'm really happy with it. Similar budget to yours, a bit more expensive, but nothing you couldn't save by staying in on a Friday night! MSI Z170A Gaming M7 motherboard (£136, after £20 cashback from MSI, deal running until end Feb I think) and i5-6600k (£189 as bundle deal with the mobo from "dabs"). You could quite easily get a cheaper mobo, I just liked the features on the M7, but i5-6600k very much recommended. You're unlikely to need much more for a good while. The GTX 970 will be outdated long before the rest of the setup is. I presume you're going to be gaming on it.