Hi I'm trying out Aperture 2 for the first time, I always used Iphoto. I have imported my large library into Aperture. Activity Monitor says that Aperture takes up 1.3 gb of memory when being used and 600 mb when It's not being using it. Is it normal for Aperture 2 to being using this much memory? Iphoto uses 350 mb of memory. My 2.66 Ghz Quad Core has 6 gig's of memory. I run aperture alongside Iphoto, Firefox, Itunes, New York Times reader, Rhapsody's flash player, etc. Should I be concerned about the amount of memory being used? Would you guys recommend that I upgrade to 8 gig's? Any info is greatly appreciated.