I recently bought a 27" iMac (i3) & I'm loving it (PC convert). Anyway, I'm wondering if more RAM would help me. I don't do anything intense, but I typically have several apps running at any one time (Sparrow, Twitter, StarPlayr, etc.). I'm also going to start getting into video. Would another 4GB make a difference? Also, does my machine come with one slot of 4GB or two slots of 2GB? If two of 2, would I be better off getting two/2 for the other two slots to match (if I understand correctly, my machine has 4 slots)? Any help would be greatly appreciated.