Well, I'm in the market for a powerful desktop to last me a few years, and am getting fed up of waiting for a Mac Pro that doesn't require a hand crank or a working knowledge of semaphore.
One of the things worrying me is that, the last time I was looking for a desktop, in 2006, I ordered a maxed out 24" iMac. It looked great, but I could always hear this occasional click coming from the screen. I guess it was the hard drive, and it wasn't loud, but because it was coming from exactly where I was looking and focusing my attention it was extremely distracting. I ended up getting one of the first Mac Pros. Even though I'm sure it was louder overall, because it was coming from 'over there', even if that was to the side or under the desk, it never bothered me at all.
So, might I have the same problem if I opted for the current 27" iMac? I know that I could get a SSD, but the only option is very expensive, yet still does not hold enough to keep everything I need internal. If there was a smaller, e.g. 256GB option, I might splash for a drobo 5D, but the way the current options are, the total price would be stratospheric.
David