Id recommend something around the 0.08/60 and 10kg would be ample. I personally use the Sanwa ERS-961 on 6v although it will handle HV perfectly ok but it is not needed to push it that hard. Even a low profile such as the ERS-971 would also be fine. Don't be scared of the new tech - brushless systems and lipos have revolutionised rc racing and had made things so much easier in most areas!