I voted even but come to think of it Neji's Kaiten would drain his chakra over time. As for Gaara crushing Nejim while is Kaiten is going, that wouldn't work because the sand would just fly off due to the spinning.

As for Kyuubi Naruto, my theory is that he was only given enough energy by Kyuubi to allow him to keep his current form (i.e. not go fox like when he did against Haku) and fight Neji. Neji probably has attained the highest level of natural chakra a genin his age/size/strength can acheive so Naruto was pushed up to the same level by Kyuubi.