You could try a TB>DVI adapter (here's one from Monoprice) but I don't know that it will work - I'm thinking that you could have at least one of your Samsung displays use it. You may also want to see if you can find a HDMI>DVI adapter for your second Samsung display - something like this?
I know that I've seen three monitor set-ups on YouTube - but I'm not sure what was connected to what. Easy enough to daisy-chain ATDs but it gets a bit tougher when utilizing HDMI ports, etc., and I'm not sure about the GPUs ability to drive all three displays.
Oops - sorry - strike that second paragraph - I thought that you were running a Retina display MBP...
Message was edited by: clintonfrombirmingham