I have the 2011 iMac and 500gb HD which I want to add some storage to. I've read tons of threads on temp sensor issues, kits, tricks, and everything else that boils down to it's basically just a PITA to swap the internal drive. I, like most people I assume, do not have any intention of moving my iMac from it's desk at any point in it's life so there seems to be no reason not to use an external drive. ~ Does anyone here have insight on running a big external HD as a sole source for the iMac basically ignoring the internal HD and booting completely from external? I booted from external when I was testing Mt Lion and had Snow Leo as my internal OS, but the test drive was only a 320gb laptop drive in a caddy. ~ Does anyone have a recommendation on an external that has both large storage, and reasonable pricing? As a bonus are any silver or aluminum finish that might try to match the iMac just a slight bit? ~ Anything I am overlooking in this plan?