Oh lord.. Hard question for me to answer.
I love F-14s, theres just something manly about them, and the first supersonic flyby i saw was done by a F-14, and the impression lasts to this day.
T-38, Its got really graceful lines, and its brother the F-5 is just as pretty.
F-16, Absolutely beautiful aircraft, and the cockpit gives the pilot great visibility, where other aircraft hide you behind a cage of steel, the F-16 sticks you out inside a giant plastic bubble. Flying that thing must be one hell of an experience.
F-4, Its just brute force, good looking, and its engine, the J-79 is absolutely incredible. Technology developed in the J79 is used in every turbine built since.
F-22, Its just scary fast. That thing can change directions on a dime, and accelerate like a top fuel dragster. Its just... godlike.
A-10, The sound this thing produces is incredible. Its like no other.