After being so thrilled with my macbook, I would like to get a desktop. I would like a g4 or g5. I've been looking around, and so far the best place I've found is macofalltrades.com. They have some good deals for g4 macs for under 500. Is this a trustworthy site? Are there any more sites like this that I can search for used macs? I'd rather not go to ebay.