Hi guys, I'm picking up the base 21.5 today. Any recommendations for optimizing my setup using the 500GB internal and an fw 800 external drive/s? I want an external as a scratch disk for photoshop, but wondering if there are any other scenarios where utilizing the external makes sense? Also, any particular external drives you recommend? For you iMac users that have been challenged by limited internal drive space, what works well for you? Thanks!