Pwrr7977 :
http://uk.pcpartpicker.com/p/R2RDdC Here is the build, I was also thinking, if I can get a few more hundred pounds, of getting an i7 4790k & another GTX 970, any advice is greatly appreciated!
I'm assuming that this is a gaming build. If that's the case, an i5 is perfect. An i7 would be overkill and not worth it.
16GB of RAM is probably overkill, but it's up do you.
I recommend going with an EVGA 970. I've heard nothing but good things about EVGA, and a couple of horror stories from MSI, but I believe that was about the 770, not the 970.
Most importantly though, you should get a higher quality PSU. If you have plans of a future SLI, definitely get a 650 watt. I recommend this...