Hm, something like Angel Beats is hard to find but i think you should watch AnoHana (Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai) , Ano Natsu de Matteru and Guilty Crown. For me those 3 have similar thrilling ending.
Hm, i loved Angel Beats too, so i looked for animes from Key. They have released Angel Beats, air, kanon, clannad and the upcoming little busters. So you can try some of those? But they are more about love and mystery, and have very little action.