Savage FVSR, by far is my favorite gun to shoot.
My full auto M10/45. Too much fun, and I've got uppers in 9mm, .45, and 5.56. The only bad part is that it is really easy to go through $200 in ammo in a single range trip.
Second would by my customized, threaded ATI Thunderbolt 1911 with my SilencerCo Osprey 45. Smooth and soft shooting, it will bring a smile to anyone's face.