I am a new member of MacRumors threads and pretty much an iMac rookie, so feel free to ignore me and/or tell me where I have run amok. I am interested in buying a fancy new iMac very soon, and I'd like to make an intelligent, experience-based choice. Noise and temperature are two of my main concerns. It seems that, relevant to these issues, there are 5 different 27" iMac models: #1 - 3.4 i5, RP570 #2 - 3.5 i5, RP575 #3 - 4.2 i5, RP575 #4 - 3.8 i5, RP580 #5 - 4.2 i7, RP580 I would appreciate it if new 27" iMac purchasers would post their experiences -- specifying their iMac configuration, task performed (gaming, editing, whatever), and component statuses (CPU & GPU temperatures and fan speed). I would love to order the i7 model (#5 above), but it would be useless if it were noisy. Thanks!