I'm buying a 21.5-inch iMac and was wondering if the more expensive Retina option is worth it if I'm going to use the 'Larger text' scaling option to get bigger text (I have poor eyesight). In other words, if I cannot use Retina's native res, does it make sense to get one over the cheaper 1080p option. Does Retina have the ability to look great even when scaled?