Are you sure you really need real time tracking? Afterall just because you see what brainwave you're in does not necessarily mean you're in the best brainwave for the task at hand. What's wrong with a system that just trains you? Thoughtstream connects to the Proteus (it's a biofeedback device you can connect to a light and sound, great for training relaxed states, there are even games with biofeedback and heart rate monitors that train you in controlling your physiology.
Alex