I have done a quick spec for you as you can see the components from Scan with postage come to £552.15.There is no need for the high priced Z68 mobo as you are paying for features that you will probably not need. I have priced for two 1TB hard-drives as in my opinion it is dodgy to have 1 big hard-drive, if it fails you could lose everything.But by having two drive 1 can act as a backup to your main drive.Main Components. Hard-drives. You do not mention whether you need to add an operating system which I advice to be Windows 7. So the total comes to £648.85 so far.
OnePlus 5T review: Hands-on