I remember when I built my PC last year with a similar budget and judging by this my specs have lost a bit of value..
It looks sexy though, I'm definitely no expert but if you're splashing out I would strongly suggest getting 16 gigs of ram (2x8g) instead of 8 gigs. It's always nice to future proof your PC a little, and the extra ram is a godsend if you end up doing video editing or similarly demanding tasks.
Also, upgrade to a 2TB hard drive. I didn't think I'd need 2TB but I've already filled up my 250GB SSD and over half of my 2TB HDD in less than a year. Best thing is it only costs an extra £20 which is pennies in a build like this.