How much should I sell these parts for?

[SandersMK1]

Hi everyone, I have a bunch of spare parts left over from upgrading my pc and a guy I work with wants me to build him a gaming pc from them.
The thing is I have no idea how much to charge for the finished build.
How much would you pay? Here are the components

Case: Coolermaster CM Storm Enforcer
Power Supply: Corsair RM750 750W
Processor: Intel Core i5 4460 3.2Ghz
Processor Cooler: Corsair H60
RAM: 4GB Corsair DDR3 XMS3 1600Mhz
Motherboard: Asus Z97-K
Graphics card: Nvidia GeForce GTX 650 1GB
Hard Drive: Corsair 128GB Force LX Solid State Drive
Optical Drive: Asus DRW-24B5ST 24x DVD/CD ± Re-Writer Black
Storage: Kingston 128gb ssd
OS: ( I will need to buy this then add it to the final cost)

So yeah if you would be kind enough to value it that would be great. GBP if possible if not I will convert it
Kenny.

 

[Mattz982]

£400 give or take, get the OS from eBay, they're about £15

 

[Sapphire Thunder]

Like Mattz982 said, 400£ is about the exact amount you can sell it for.

 

[SandersMK1]

Cheers Mattz982 and Sapphire Thunder, that's great. Can get another 970 with that money

 

[Mattz982]

How old is the psu and do you think I could buy it?