Which of these options?

My birthday is coming up and I've found a beautiful necklace in my boyfriend's desk drawer. So I tell my friend:

1. I already know what he's going to give me.

2. I already know what he'll give me.

3. I already know what I'm getting from him.

4. I already know what I'm going to get from him.

5. I already know what I'll be getting from him.

6. I already know what I'll get from him.

Which one of 1-6 should I use? To me the first one sounds more natural, is that correct do you think?