I say the best team would be

Naruto
Temari
Neji
and KaKashi as leader

KaKashi easily replaces shiKamaru in tactics and power. and he can also copy all the enimies jutsus(almost). and tracK people and summon.
Naruto is a mid- to long range fighter. he's also there to provide surprises and distractions. He can also summon and do rasengan. He can also tracK his teamates with a tracKing frog liKe jiraiya does
Temari is the long range fighter and also provides and incredible defense. She also can summon
Neji is the close range fighter that can shut down anyone. He is also the scout for he team.


The flaw of the gaara, naruto and shiKamaru plan is that if the get distracted and split up. then they're screwed. If shiKamaru get seperated from the team he might die. then if gaara and naruto had to do things on their own they might also be Killed. although i'll give PSJ(pervert senin jiraiya) credit, gaara would be a lot harder. but not everything calls for or depend on strength.

If my team seperates i 'm sure neji, KaKashi could find everyone. The weaKest person on the team intelligence wise would be naruto. I'm certain that he would be a team player as long as you respect him.
And there you go the perfect team. unless you want to add the lengendary sannins or Kabuto and itachi. then my plan all falls apart.