New pc - need fast answer

[Ugaki]

I plan to buy today/tomorrow this parts to make new pc (mainly for games).
Did this parts will work together with no problems, if not what should I take(I have 800pounds for everything?

Gigabyte Z68X-UD3P Intel Z68 - http://overclockers.co.uk/showproduct.php?prodid=MB-342-GI&tool=3
Intel Core i5-2500 - http://overclockers.co.uk/showproduct.php?prodid=CP-368-IN
MSI ATI Radeon HD 6950 - http://overclockers.co.uk/showproduct.php?prodid=GX-128-MS
G.Skill RipJawsX 4GB - http://www.overclockers.co.uk/showproduct.php?prodid=MY-203-CS&groupid=701&catid=8&subcat=1517
Case - http://overclockers.co.uk/showproduct.php?prodid=CA-221-CM&tool=3
Power Supply - http://www.overclockers.co.uk/showproduct.php?prodid=CA-011-CS&tool=5
CPU Cooler - http://www.overclockers.co.uk/showproduct.php?prodid=HS-072-AK
Hard Drive - http://www.overclockers.co.uk/showproduct.php?prodid=HD-082-SA&groupid=701&catid=14&subcat=1279

and what "OEM" means?

 

[Ugaki]

I edit first post (changed for; Corsair XMS3 4GB, Corsair power supply, and 1tb hard drive)

I will wait 2h for other suggestions and then I going to buy it

@ I don't plan any over clock for now.

 

[Ugaki]

I change back to i2500k and CPU cooler

Also did I have to buy sound card?

 

[Ugaki]

last question which of this two motherboards work better?
http://www.overclockers.co.uk/showproduct.php?prodid=MB-051-AK
http://www.overclockers.co.uk/showproduct.php?prodid=MB-342-GI