[bmah]

IMO, best kart combinations don't exist when it comes to playing a tournament or grand prix because each stage may place certain emphasis on various parameters. For instance, some stages may be turn-heavy and therefore acceleration and handling is crucial, while other stages are largely off-road (underwater isn't offroad but is in fact another [albeit hidden] parameter).

On an individual basis of each course however, you can definitely be more objective about it. (and on time trials, I put preference on heavyweights)