The best Avenger comics to get? (For someone who's never read the comics?)

I have a special someone who loves the Avengers movies and has seen all of them multiple times. As a gift, I want to give him a collection of some great Avengers comics, but I'm pretty much lost as to which to buy. I'm hoping some good people on this Forum might want to help me out? What Avenger comics would you buy, and why?