depends on what you mean by affordable??
what calliber of car are you reffering too? a full out racing chassis only for comparason? or an ready to run kit type setup for comparison. there are alot of variables not stipulated that need clarification for a just answer.
any xray fk05, corally rdx, tamiya evos and 415, yokomo sd and bd, hot bodies cyclone or hpi pro 4 i'm sure i missed many.... there are so many to list... prices would vary from $500 to $700au for the chassis kit only for these cars.
all of them are just as capable as winning as the other, its just the bloke at the end of radio that makes the difference and what you know about how to make them go that seperates them from each other. there are many drivers that could swap cars and still be on top, and everyone follows like sheep its really funny