£600ish build with a few components brought already

[uberw0lf]

Hey, so I recently started looking to build up my own rig and purchased a few components, mainly an Intel i5 3750k and a half decent case.

I did have around £800 to spend when I purchased the processor, but unfortunately due to life being a dick I have had to drop that price quite a bit and haven't had time to do the research myself.

So I have around £400 to spend on the rest of the items, what would you guys recommend?

 

[uberw0lf]

It would be for gaming yeah.

I have the peripherals, a monitor and have Windows 7, so its really just the other internal components i'm looking for.