I am currently in the market for a dual monitor set up for my 15 rMBP. While I obviously love the screen, I have found that a desktop setup with two external displays can boost my own productivity quite substantially. Does anyone have decent suggestions for this type of set up? I'd like to keep the total cost sub $700, and I don't feel that 4k is necessary at this point in the cycle. I have already considered looking at the Thunderbolt Display but am turned off by the dated technology as well as the possibility of an upcoming upgrade. Clearly, the monitors would have to have the proper outputs/inputs for the rMBP, meaning an HDMI port and/or Displayports. I have done the VGA to mini Displayport adapter in the past, which was fine, but I would prefer to go the all digital route. No specific specifications necessary- looking for the best overall experience.