A friend of mine is a modest gamer (mostly COD games) and he recently bought Assassins Creed : Unity and his PC just fell over trying to run that 
So with a budget of ~£800 I'd like to try and upgrade him to something that will play modern games, modest settings are ok.
His current spec is
Q6600 with appropriate Mobo and RAM
Generic 500W PSU
Geforce 560TI
HDD
The only thing we can really salvage is the case, which is an Antec 900 and re-use the mechanical HDD
So I'm thinking, CPU, Mobo, Ram, PSU, an SSD for running the O/S, probably still use onboard sound - he uses headphones exclusively.
Not sure if we can fit a Graphics card in that budget as well? So if we can leave some left for a future Gfx card and wait to see what the new AMD 300 series comes in at.
I have lent him a HD7950 for now which might tie him over with the new build.

So with a budget of ~£800 I'd like to try and upgrade him to something that will play modern games, modest settings are ok.
His current spec is
Q6600 with appropriate Mobo and RAM
Generic 500W PSU
Geforce 560TI
HDD
The only thing we can really salvage is the case, which is an Antec 900 and re-use the mechanical HDD
So I'm thinking, CPU, Mobo, Ram, PSU, an SSD for running the O/S, probably still use onboard sound - he uses headphones exclusively.
Not sure if we can fit a Graphics card in that budget as well? So if we can leave some left for a future Gfx card and wait to see what the new AMD 300 series comes in at.
I have lent him a HD7950 for now which might tie him over with the new build.