Hey guys. If you saw my last post.. I'm looking to buy a new iMac. One of my final questions is that is upgrading to the 500GB HDD a bad move? I read somewhere that having a near-full HDD will affect performance of your machine. Is that true? And can the 2.4GHz iMac w/ 2GB of ram still perform well with the 500GB HDD? Does having an external HDD make the computer work less hard since it's not the primary storage bin? Thanks in advance for your help guys!