Hey everyone!
Well, after going back through this thread, I'd say we've got an impressive array of answers. Choosing just one aircraft is difficult. My initial answer, the F-15C was a gut reaction (as are all of these answers, no?) but after thinking on it for a while, I have to add more. Picking one overall aircraft is too limiting.
So, I'm adding to my list.
F-15C (as previously stated)
F-105D (Ugly? maybe... but it has that attitude that everyone's talking about... gotta love that. Plus, the one here at the Texas Air Museum flew 292 combat missions over North Vietnam. Anything that can do that is beautiful in my book!!)
Fw-190D-9/11/13 Just a beautiful airplane! I've built about 15 of them in the past decade and never seem to tire of the possibilities! A truly sexy aircraft!
that's my $.02