I'm planning to buy a powermac G5 dual 1.8GHz and I was wondering what's the difference between 3rd party RAM and the RAM from apple? If there is no difference, or very little difference, is it best to buy the computer with the default 256 MB RAM already installed and then add RAM from a 3rd party supplier? I'm planning to have at least 1GB RAM for my graphic design needs. If anyone has any suggestions on what I should do that would be great. Any recommendations on where to buy RAM too would be great. Thanks.