Raspberry Pi, best way to program it?

Continue to experiment with Raspberry Pi, still not decided which software route I should go:
Python, C, C++ with QT, or Java. For me its necessary to have access to the Raspi Cam, accelerated graphics with OpenGL ES and OpenCV. I tried Java8 and followed this steps http://www.raspberrypi.org/forums/viewtopic.php?t=73489&p=528225 to get it running and it works. Framerate is low but I have to conduct more tests, it seems to run OpenGL accelerated anyway...