Apple continues to focus its consumer desktop efforts around all-in-one iMac designs, for better or worse, with its most recent upgrade efforts centered on bringing Retina displays to them. The latest refresh to the 21.5-inch iMac brings with it a 4K Ultra HD panel with support for the P3 color gamut favored by graphic designers, giving it additional appeal. While the new display is a real highlight, the question is: should you jump in with the entry-level model, our review unit, or go for one of the other options? Check out our review for the pros and cons.