wich EX battle deck is the best to buy and cheapest to upgrade?

A friend of mine wants to start on pokemon TCG and I really want him to have the best start possible, so, wich of the EX battle decks (those "level 1" ones, like chien-pao ex, tinkaton ex etc) is the best one? I know that chien-pao is the best one, but I want more options for him to choose. Maybe you guys could do a top 5 best?