Curious you guys think the retina mbp is worth the upgrade? Two reasons that I would consider upgrading. One is of course the retina compared to my current 15" hi res tn panel. And two the ability to use multiple displays (I would like to connect my mbp to my projector and 27" Thunderbolt Display). Also regarding the projector and 27" display, you guys think its possible without any frame rate drops from movies in hd?