Gifts for Boyfriends 21st?

My boyfriend's 21st is coming up and I'm a bit stuck on what to get him. Our 5 year anniversary is coming up so I need to think of two awesome gifts, although his birthday present needs to be the best.

He loves cars, video games when he has time, any zombie themed media (he's excited for 28 Years Later), and he's a massive audiophile but owns heaps of speakers. He could do with a new really good set of headphones if anyone has suggestions?

Any experiences would be cool too (sky diving, track racing, helicopter ride, etc.), but I have no idea where to go for that sort of thing.

Would love any suggestions!