£1000 Gaming Pc and £300 Gaming PC

Overclocking a GPU isnt hard. It comes with software to help you do it. I found it easier than Overclocking the CPU which I assume you know how to do. 

Thats a nice build, any 7970 thats under £300 wont provide any benefit over the 7950. I would suggest dropping the h100i for something cheaper, maybe a H80i or a dark knight. I would also suggest getting this 7950 instead: 

http://www.scan.co.uk/products/3gb-msi-radeon-hd7950-twin-frozr-oc-be-5000mhz-gddr5-gpu-880mhz-1792-cores-dvi-hdmi-mdportplusfree-g 

This will save you some moneyand is the second best 7950 in my opinion. 

Ok i will change it to the MSI 7950 and i had this CPU cooler in mind. http://www.overclockers.co.uk/showproduct.php?prodid=HS-020-XG

Logan put it up against a h100 and it got just as good temps and he said it was pretty quiet, so i think i should get this? 

Also is MSI's software for overclocking any good?

Yea i know how to over a CPU :D

MSI's overcloking software is one of the best in my opinion, ASUS' is better but ASUS does have all the nice software. I think the Dark Knight would make a very good replacement in fact I use one over a H100i in my build. Just got my H100 lying around in its box lol. Probably end up ebaying it. 

Oh and I saw it cheaper here http://www.dabs.com/products/xigmatek-dark-knight-nighthawk-heatsink-865P.html?src=15 thank me later lol.

I just noticed that the Ram you have chosen has gone up in price by £20 so should i get the corsair vengeance ram instead? 

By the way could you recommend a good USB 3 Pen Drive for installing Windows 7. I think i only need 8gb for installing Windows 7? 

Just get any USB lol. Yeah 8GB is fine. https://www.youtube.com/watch?v=aFJwiILbsdo 

Get different RAM like corsair vengence. Also keep an eye out to see if the RAM I suggested comes back in stock with the lower price. 

I have this Windows 7 USB-DVD tool that does all the work for me. I have also downloaded the ISO which you put into the tool. That tool does everything to the USB and put Windows 7 on the USB. I have the product key if you are wondering. 

Totally legit is it lol 

The Final Build: http://uk.pcpartpicker.com/p/1ewmp

I hope i will be super happy with this and run into no problems when building the PC.

Thanks for everything

~ no worries