From what I can see, the processor inside the 24" iMac is a true 64bit processor. Is this true? I know that Leopard is suppose to be full 64bit when it comes out, but if I were to get a new 24" iMac today, and I suddenly became insane and wanted to install Vista on it, would I use the 64bit version of Vista? And if the iMac IS 64bit, why is it that it can only use 3Gigs of RAM in it? Thanks...I'm about to come back to Macs after about a 6 year absence right after we get our tax refund.