External display for Macbook Pro retina I want to buy a Macbook Pro retina and also an external display for when I'm at home. I could of course buy Apple's thunderbolt display, but I'm looking for alternatives. Will every screen be good or do I need to look out for specific specifications because of the retina display? I guess when you are used to a high-res retina screen, the resolution of the external display should also be very high to match the Macbook retina screen?
You can set the resolution of the external display independent from that of the retina display. 

I personally use a Full-HD display with a VGA->Thunderbold adapter at work and at home a Full-HD display with a DVI->Thunderbold adapter. 

I prefer the DVI variant, but this is also because of the generally better display at home.