Help a newb choose his first robot kit! please read this:)

[peretz]

Hi,
I am a student for math and computer science, and i am familiar with many programing languages, and my tech skills are adequate (i am trying to say that i am capable of building and reading forums for instruction on how to program everything you might throw at me ((I hope)) ).

I want to buy a robot kit, and I am not sure what to choose, and which accessory's / sensors etc.. to buy, so i turn to the experts
I want to be able to program the robot for following my brother (or just do things near him) while he performs a 45 minute show, and execute simple voice commands. ( i would like to add visual recognition for the robot to tell the difference between a ball and a leg at some point also if its not insanely complicated).

what i expect from the robot is:
first : he has to be very agile like the robonova to impress the audience with doing back flips and such...
second : he needs to last for 45minutes to an hour if possible more, and be as much reliable and durable as possible (my brother travels a lot and the poor thing might get hit on a daily basis )
and last : again if possible he needs to be as autonomous as one can expect from these little ones, ohh and humanoid.

Please help me by telling me which kit and extras to buy.


Thanks,Oran.