Why not an SSD OS drive and a couple of 1TB disks for everything else?
Here you go. This is for the OS and games!
http://www.overclockers.co.uk/showproduct.php?prodid=HD-001-CS
Then this is for anything else, you can change things around if you wanted to.
http://www.overclockers.co.uk/showproduct.php?prodid=HD-081-SA&groupid=701&catid=14&subcat=940
Put 2 of them sammy's in raid, you got a great hard drive setup there.
When setting up the Raid 0, make sure it's the 2 f3's and set the data striping as "128kb".
I'd have gone for a pair of 1TB drives for storage, especially at as little as £60 each!