i have owned every buggy you listed except the k-car and they all are pretty good i really didnt like the sportwerks but the rest are good and i would look at the OCM Kaos evo buggy it has just as good quality as any of them and probably better than a couple and its really good out of the box i have been driving mine for around 3 months and the car is very good tough drives easily and the parts and finish very nice and its a very good buy.