Minato is a pretty good choice, he hasn't really display the feats Naruto have but Naruto was taught all of that by Bee. Chakra arms, using Speed, making ttb rasengan. Hashirama would make a great choice, Kurama's chakra was full of lifeforce that reacted with Yamato's wood jutsu so imagine the powerup Hashirama's wood jutsu would be.
2nd person with high IQ I would like to see have a chakra boost is Shikamaru, Shikamaru weakness is his lack of fighting power so the speed power up, chakra arms, sensing ability would all help him fight better. I think he needs to work on taijutsus and ninjutsus.