Hello, I'm switching to a new 24" iMac and I would really appreciate some advice. A large part of the reason I'm switching is to get a really quiet machine. I haven't actually seen/heard a new 3.06 Mhz iMac (because they're build to order) and I was wondering if the upgrade to the more powerful nVidia graphics card + the more powerful cpu + doubling the ram from 2 to 4 GBs has much of an effect on the 24" iMac's quietness/coolness. I guess I'm a little in awe of how quiet and cool the 2.8 is and I don't understand what it is about the iMac's case that allows Apple to can get such high performance at such minimal heat/sound expense. I realize different graphics cards can have hugely different sonic signatures and I've seen it mentioned that the base ATI card is actually better than the nVidia card except for playing games. BUT, I will be using a secondary 24' monitor. Does that make the nVidia card a much better choice? Thanks for your help!