FeLV is up to you, but it is the one that is most controversial, and most vaccination side effects are related to the FeLV vaccination. Of course, many cats have it every year without any side effects, but it is something worth thinking about and maybe considering having when he is a bit older. Personally, I think having them all at the same time when they are so little is a lot for the system to deal with. having said that, Mosi had it when he was a kitten (he was vaccinated by the breeder before I got him) and he was fine.
I don't vaccinate against FeLV because my cats are indoor cats. If yours go outside, then it's probably worth having. But do discuss it with your vet.