RE: Pitts choice...
I have the Cermark with a ST2300 in it. It flies just fine. I like it because it will fit into the minivan all together. I don't fly it much, just on special occassions, since I got the Goldberg 30% Ultimate. I really like that plane allot and easy to put together, since there aren't any flying wires on it either. My Cermark has been around since January of 2001, had some really hard landings and even been cartwheeled when I let a friend fly it. Like they said, one tough bird.
I will be selling mine to a friend this spring. Hope you enjoy yours as much as we have enjoyed mine. BTW the Ultimates do fly allot better, but they just aren't as attractive as the Pitts.