The new spinpoint F3 is a nice quite, cool running drive. The WD Black and the Baraccuda both out perform it but speed isn't everything.
What about fans for your Megahalems??
I'd suggest this fan http://www.newegg.com/Product/Product.aspx?Item=N82E16835185060 you might want to go ahead and buy 2, if your temps are to high with 1 you can put the second on in Push-Pull.
They make a 1600rpm version that is dead silent but only moves 80cfm or so but you could get 2 of those if you want a quiet computer under load. http://www.newegg.com/Product/Product.aspx?Item=N82E16835185059
But it appears to be out of stock right now
maybe I am confused about something, but I thought the megahalems were the heavy duty fans. The CM690II Advanced already comes with two fans installed in the front and back and figured they would be enough on top of the megahalems and could set them to a push-pull.
also, do you have any idea about wireless. What do you do for internet?