PC Connection Express offers the Apple iMac Intel Core i5 2.8GHz 27" Desktop, model no. MC507LL/A, for $1,699. With free shipping, that's the lowest total price we could find by $22. Features include an Intel Core i5 2.8GHz quad-core processor, 27" 2560x1440 widescreen LCD, 4GB RAM, 1TB 7200 rpm hard drive, DVD burner, ATI Radeon HD 4850 512MB graphics, Bluetooth 2.1+EDR, Gigabit Ethernet, 802.11n wireless, iSight, and more.

Although PC Connection Express lists this as a Core i7 model, the only 2.8GHz processor available from Apple is a Core i5 model (which also has a 1GB video card instead of 512MB).