Depending on your bent, you may find R (http://www.r-project.org/ http://www.r-project.org/) with Python (http://www.omegahat.org/RSPython/ http://www.omegahat.

Depending on your bent, you may find R (http://www.r-project.org/ http://www.r-project.org/) with Python (http://www.omegahat.org/RSPython/ http://www.omegahat.org/RSPython/) a very powerful combination. More statistical than some of the others you mention, and sadly constrained by memory unless you play some games, you will probably find that most cutting edge stats code is available for R. Data mining and AI folks also use R, but as you point out, other matrix and functional languages may fit your specific approach.