i have to ask, why? you can get decent lipos for less than what a good nimh pack will cost and get far better performance. this battery and charger will work with pretty much any brushless system you choose.
http://www.amainhobbies.com/product_...rger-6S-5A-50W
http://www.amainhobbies.com/product_...-ROAR-Approved
this brushless system should offer plenty of power without being too overpowering
http://www.amainhobbies.com/product_...r-Combo-3900kV