[Seahawk]

The Husky is a great plane, and the Pitts is, well, a Pitts!
I've done a lot of acro in both civilian aircraft, military aircraft and, for a truly wild ride, in a British Lynx helicopter. The Lynx has a ridgid rotor system and is able to loop, roll, split s, etc.
The one rule that always goes through my mind when flying acro is: "When it comes to low level flight, you can only tie the record!" Fly high indeed.
All the of previous posts capture the enjoyment of acro, so I won't restate. If you haven't already, I recommend that you look into the Experimental Aircraft Association (EAA) web site for resources on acro training, experimental aircraft and a lot of great advice on all things aviation. The annual EAA convention in Oskosh is a must at least once in your life as well.
All the best.