I am thinking of getting a G5 2.0GHz and am debating between a Rev. A and Rev. B (probably with the upgraded graphics card)... I want to pretend for a moment that money isn't a factor (although in reality it is) and compare the two. Would I notice any difference between the original 970 chip and the 970fx? It the 970fx really superior in many ways? Energy consumption is important to me, and I hear that the chip is improved in this area, but how big a difference would this really be? And how about performance improvement? Lastly, is the internal architecture any different on the two models? if I recall, the insides look slightly different in some ways, or...? I'll be grateful for any expert guidance.