I've got a Retina MBP and a Thunderbolt display. Traditionally, I'd have the larger display as primary and closer to me. However, I'm wondering if this is optimal given that the resolution of the MBP is so much higher. Should I instead have the MBP with retina display as primary display and closer to me and have the 27" Thunderbolt off to the side as the secondary display, further from me, thus reducing my ability to discern individual pixels due to viewing distance. What's everyone think?