We just sold our G5 Quad and 20" ACD for $2300 and are considering the iMac as a replacement. Here were the specs on the G5: PowerMac G5 Quad, 2.5 GHz -4GB RAM -500GB 7200 RPM HD -16x SuperDrive -NVIDIA 6600 256 sdram -Built-in Airport Extreme & Bluetooth -Apple Pro Keyboard -Apple USB Mighty Mouse -AppleCare through: January 24th 2009 What we did not like about the G5 Quad was: 1) Slower than expected, especially the graphics card. 2) Noise of fans 3) Heat My questions are: -Do we need the 2.8GHz "Extreme" version? -Do we need 4GB RAM? We use Aperture, and Photoshop. Thank you. .