I dont know much about mini/micro RCs or about electric RCs. I do know that the LST is one of the best monster trucks ever. Solid, great handling and made by a company that is well known. I wouldnt reccomend a 1/8th scale nitro for a 6 year old but they do make a mini and micro version that i have heard good reviews from.
http://www.losi.com/Products/Feature...rodId=LOSB0215