So, I got excited about the prospect of running two extra displays on my new Retina MacBook Pro on account of the fact that it has two ThunderBolt/Mini-Display Ports.
At the office I have a gorgeous 27inch Thunderbolt display, connected via Thunderbolt, as well as a 24 inch Samsung LED display running off the VGA. Those, combined with the Retina display of the MacBook Pro itself makes for a stack of screen real estate and makes me a happy man. At home I have two 24inch BenQ displays - they're fine too.
Why stop at two?
The Retina MBP also has a HDMI on the right-hand side, which can run a third display (for a total of 4!) - that alone for a laptop is pretty impressive, but don't forget that Mavericks brought Airplay/AirDisplay on AppleTVs too! Could it power an additional one or two AppleTV AirDisplays??
Where does this all end?
At some point (fairly soon) we're gonna run up against the video card's limitations and then there's the lag with AirDisplay, which makes it a little impractical for any realtime work - but fine for say a web dashboard or monitoring Twitter etc.
The Retina MacBook Pro is an impressive piece of kit on its own, but mate it up with a few displays and you have an admirable desktop replacement, with greater built-in display capabilities than the MacMini or even an iMac. I think I made the right choice. ;)
Video wall, anyone?