I went with (in order of prediction top to bottom)
Dark Knight Rises
Brave
MIB3
Prometheus
Battleship
I'm pretty happy with my top four; the fifth one is a total tossup. Out of country reviews for Battleship say it's mindless eye candy, so that's the making of a perfect summer blockbuster. There is little chance that DKR does not finish in the top 5, a long awaited Pixar film also is a sure fire winner. MIB3 has been a long time coming, and it looks fun, so I think it's safe. Prometheus is another winner in my mind too...it looks like it oozes the essence of the classic Alien movies (even though it's only related to them, not a prequel).
I know Avengers will do well, I just don't see it as top 5, but it will be close. The rest...meh. I'm sure they'll do well enough but I get that "I'll wait for it on DVD" feeling with them.
Q "Why do you like Duke, you didn't even go there." A "Because my art school didn't have a basketball team."