The 27-inch iMac is already a milestone for Apple through its inclusion of a truly greater-than-HD display, but the addition of Core i5 and Core i7 processors transforms it into a near powerhouse. This is the first iMac in recent memory to come close enough to Apple's workstations that it could replace one of them. Our review of the Core i5-equipped iMac will find out how close it comes to that goal and whether it's a worthwhile option for any other prospective Mac desktop owner.