Build - Gaming PC *require help

I haven't build a computer since around 2007, so my building skills aren't quite up to scratch !

Here's the build I'm looking at



I need help choosing what RAM ( DDR3 ( 1600+ ( 8-16GB)))
And also choosing which case ( A reputable cooling case )

Also any other tips you can give me on the choices I've made, such as better value for money?

Thanks in advance for any help given.

*notes
-This setup must at least play modern games in high graphics. ( That's why I'm looking at the 690, but I guess the 660 or 670 can't remember which would be a better choice for money.

 

Dont go with that I7. If you must have an I7 get the 3770K, but for gaming the 3570K is perfect.

http://www.xbitlabs.com/articles/cpu/display/core-i7-3770k-i5-3570k_6.html#sect0

 

For this system, going to a processor that's 2/3 the price of my motherboard. I think I need tor reconsider the parts I'm choosing.

 

May I ask, isn't this currency GBP? If so, you're getting thieved! Nothing of these is worth the price, IF NOT, Correct me and tell me what's the name of the currency (Don't troll me for not knowing what's this )
And what site did you use to have this thing in your post?

 

Why bother buying a soundcard? Onboard is usually fine.