Hello.
Your task is very interesting for me and hope, I can be useful for you.
I had work with language models using Python and Natural Language Toolkit earlier, so this area isn't new for me.
Moreover, I can be helpful to you in your other (I suppose) project "Class based n-gram Language Modeling SRILM".
Write me, if my bid is interesting for you, for next discussion. Of course, the price and time of the solution delivery will be change depend on the agreement.
Have a nice day.
Kind regards.
Alex.