Hey Guys, So I've decided to get an iMac 27" model and I'm still trying to figure out what is best for me. I'm debating between getting a 2010 model and installing a perpetually upgradable SSD as the main boot drive vs getting a newer one and using velcro to affix an external SSD via firewire to the back of a newer iMac and upgrading that as a way to avoid the apple tax on the external storage. Has anyone tried this? Are there ever situations where you notice the speed drop? If I threw all my photos and music on the external drive, would I notice any issues? Could I have my iPhoto library and iTunes music library on that external drive and not have issues?