I'd like to get completely away from spinners. That said, I wonder if a fusion drive on an imac is a good idea. On a flash drive there is no way to swap or upgrade the drive - right? But on a fusion drive that spinner can be replaced (at the expense of the warranty) - right? It seems to me then that instead of paying the $800 up charge for a 1tb flash drive, it might make sense to get a fusion drive and swap the thing out a couple years down the road.