SR71; fastest airplane (except the A12), and absolutely awesome to see.
F15 ; the only fighter with a perfect air to air combat record and in its time a game changer
F22: the successor to the F15 which currently rules the skies
A10: if you need air support, it's the most beautiful fixed wing aircraft in the world, I am told
Honourable mentions have to go to the latest Sukhois which IMHO are the most beautiful planes in the air, certainly the most maneoverable with their full exhaust vectoring; B52, by far the longest lived front line aircraft if not weapons system ever, which literally scared the sh*t out of enemies, the B2 which is an absolutely incomparable bomber out of a science fiction movie that reminds me of the old flying wing, the Soviet/Russian Backfire bomber, simply because it's like a rough-hewn B1 on steroids, and I love the B1, and the Vulcan, which is the loudest scariest plane I ever saw or heard, complete with howl.