So I have just received my brand new 2.4 GHz Late 2011 15" MBP, which I am extremely happy with so far. The only concern I have left is storage at the moment. I was planning to do an SSD + HDD (optibay) setup before, but once I started up the MacBook I couldn't stand the drive noise of the stock 5400RPM HDD (probably because I came from an MBA). I immediately took it out and replaced it with my 256GB M4.. Problem solved, for now. Eventually I know it's inevitable that I will need more storage, primarily to accommodate movie projects, Windows and a few games. So, would you guys think there's an even more quiet HDD than Apple's stock HDD? Or should I go with a relatively cheap previous generation SSD next to my blazing fast M4? (I have already found that a previous gen 180GB SSD ≈ 1TB HDD in terms of pricing.) Thanks in advance.