I use a 320g main hard drive for my main because thats all i have. for my games i use a seagate barracuda 1TB because my main drive cant hold all my games and files and then a 250g laptop hard drive with nothing on it because i don't wanna risk it.
I just bought the XSPC AX240 and that fits on the top granted i dont have another rad on the back ,however i have a 140mm fan there.
I also might buy another one
well to be honest im not sure but thats what i had todo with my iphone 4 it broke so i sent it in and they sent me back a 4s i just had to pay an upgrade fee.