Hi all. I've got my 27inch base imac on order and opted to upgrade the harddrive. Im unsure if I made the correct choice. I want quicker boot up times thats for sure and quicker app opening times. Im coming from a laptop which had around 256 gb of storage and that is mainly all filled after 3 years (although it contains now redundant material). I think I could live with a 256 drive with some effort but only if the advantages over a fusion is heavy? Can someone please explain? One thing I wont do is slap a big external drive to my imac as soon as its unboxed as this to me defeats the purpose. I do however backup to external hdd. Any help much appreciated. Thanks!!