TT01 and TA05......Must be buy TA05 la TT01 the price seem cheap but the kit is very low level but TA05 the price seem extensive but the kit is not bad, you only modifly little parts can get a good perforcemance,if TT01 modifly the kit near to TA05,the price must be expensive than TA05.But if you are a new hand and want to try to play rc car,I suggest you buy ABC mini,Price about $900-1000 no need to modifly and the perforcemance is not bad