I agree with Rolex, if money was not the issue, get all three. But that is not what you are really asking.
I still say Revo. You say you want something that drives different than a T-Maxx. Have you spent any time driving a Revo? Although the Revo is classified as a MT, it is a different animal altogether than any other MT. And with the option now of adding a big block, and yes, the chassis can handle it, it seems the answer for you is Revo. Like I was trying to say above, the Revo seems to drive like a fat tired buggy if you leave the suspension in the lower end of it's range. This is one of the reasons I spent a lot of time searching out the new Traxxas Sportmaxx bow tie tires. I wanted the buggy track experience but lacked a Revo alternative, until Traxxas released the Revo made bow tie tires.
Funny enough, and Rolex knows how I got the T-Maxx, I bought the T-M about 3 weeks ago, AFTER I already bought the Revo just before Christmas. Why? I wanted the real MT ride and experience and the T-M made sense since I was already a Traxxas owner. In fact, I finally get to break the T-M this weekend as I plan to go to the desert, if it does not rain!
