which OS?

Hello, I'm very new here and I wanted to ask if you already choose an OS? On the website I read that you don't want to use FreeRTOS. Is this information still up to date? Which RTOS u want to use instead? I have found a small summary of potential candidates at wikipedia: http://en.wikipedia.org/wiki/List_of_real-time_operating_systems the best candidate seems to be BeRTOS, but i think it could be a little bit too much (e.g. it has a complete graphics subsystem). Regards Arne