Imac G5 purchase

Hello everyone. The economic times have been hard on all of us, but this is no reason not to be interested in owning a faster mac. I have an imac g4 that is starting to feel a little slow, and I am considering selling it with the profit going into an imac g5. Now i know the prevailing wisdom would be to go intel, but I already have a macbook and a powerful windows computer doing that. I want to get a 17 or 20 inch isight model, and I was wondering if anyone has heard about the reliability of these, or if it would be better to look elsewhere. Thanks for checking out this post.