That build looks perfectly fine to me. If it were mine, I would get maybe a 700 Watt psu, but that's just because I'm paranoid about power requirements. The only thing I would recommend changing is the case. I'm a bit "iffy" when it comes to In-Win cases, so if it were my build, I'd go with a more reputable brand in the same price bracket like the Bitfenix Neos. But if you are comfortable with your choice of the In-Win case, then by all means go for it. I hope this helped, and good luck!
i was actually looking at the corsair vengeance c70 - http://uk.pcpartpicker.com/part/corsair-case-cc9011019ww and the psu wa only because i had already purchased it at the time (was told that the 750w was only recommended because of low quality psu's) but thanks dude hopefully when i put it up here it won't get downvotes (seen too many nice builds with downvotes lol)