I think I've finally decided to upgrade my current iMac to the new G5's. Of course, like most people, I plan on upping the amount of RAM. I've noticed that to buy the RAM from Apple, it will be more expensive than buying from one of the places listed at MemoryToGo.com or 1-800-4-MEMORY. I have a few questions about this: 1. Is Apple RAM better than buying RAM from another place, or is RAM just RAM? 2. How much should I put in it? I was looking at putting 1GB I'm unsure whether to do two 512's or one 1GB and leave in the 256 that comes with it. 3. Finally, I heard that if you have two identical RAM, such as two 512's that are the same brand, they will run faster than having a single 1GB chip. Is this true? Any help is most appreciated! Thanks!