I'm trying to write a pretty heavy duty math-based project, which will parse through about 100MB+ data several times a day, so, I need a fast language that's pretty easy to use. I would have gone with C, but, getting a large project done in C is very difficult, especially with the low level programming getting in your way. So, I was about python or java. Both are well equiped with OO features, so I don't mind that. Now, here are my pros for choosing python:

Very easy to use language
Has a pretty large library of useful stuff
Has an easy to use plotting library

Here are the cons:

Not exactly blazing
There isn't a native python neural network library that is active
I can't close source my code without going through quite a bit of trouble
Deploying python code on clients computers is hard to deal with, especially when clients are idiots.

Here are the pros for choosing Java:

Huge library
Well supported
Easy to deploy
Pretty fast, possibly even comparable to C++
The Encog Neural Network Library is really active and pretty awesome
Networking support is really good
Strong typing

Here are the cons for Java:

I can't find a good graphing library like matplotlib for python
No built in support for big integers, that means another dependency (I mean REALLY big integers, not just math.BigInteger size)
File IO is kind of awkward compared to Python
Not a ton of array manipulating or "make programming easy" type of features that python has.

So, I was hoping you guys can tell me what to use. I'm equally familiar with both languages. Also, suggestions for other languages is great too.
EDIT: WOW! you guys are fast! 30 mins at 10 responses!
If those are the choices, then Java should be the faster for math intensive work. It is compiled (although yes it is still running byte code).
Exelian mentions NumPy. There's also the SciPy package. Both are worth looking at but only really seem to give speed improvements for work with lots of arrays and vector processing.
When I tried using these with NLTK for a math-intensive routine, I found there wasn't that much of a speedup.
For math intensive work these days, I'd be using C/C++ or C# (personally I prefer C# over Java although that shouldn't affect your decision). My first employer out of univ. paid me to use Fortran for stuff that is almost certainly more math intensive than anything you're thinking of. Don't laugh - the Fortran compilers are some of the best for math processing on heavy iron.
Java or Python for math?