I voted for the 1080p+ IPS monitor option.
Yes, Retina is fantastic and given the choice, I would never move away from it. I would never go back to the MBA's screen willingly as all my Apple devices now have Retina displays.
However, at work I have a fairly old HP w1907 monitor that can only run as high as 1440x900. When I don't have my rMB next to me and switching between the two, I can manage. However, I can definitely notice the fuzziness and while it won't make my eyeballs bleed, it is a significant backstep to what I'm used to.