When it comes to a notebook, I understand why apple chooses 'performance' from ATI's lineup (for those who don't know what I'm talking about, ATI's cards can be divided into four sections: Mainstream, Performance, High-end, & their flagship Ultra High-End 6970). Apple usually puts the Performance/High-end cards in their Macbook Pros which makes sense because they are portable notebooks and battery life, heat, & over all performance has to be considered. But when it comes to a desktop like the iMac, why are they not putting a high-end or ultra high end ATI? After all it is a desktop so there is no performance constraints to worry about like battery life, heat etc. So whats going on at Apple? Why are the copping out on the iMacs?