I learned on a 92/93 K2 AC 161 which was the smallest of the sizes I could get for an "all mountain" board from K2 at the time. I think I had the choice between the 161, a 166 and 176 if I recall. I really wanted the Farmer pro model but I think it only came in a 166 and felt too big to me. That thing definitely rode me.. was damm stiff, especially at the size and my size at the time, fast as hell too. There was no lazy riding on that thing.
I ride a Salomon Man's board now and it is also a board that requires some focus, I tend not to push my luck if I feel I am getting tired. Would rather call it a day a run early and feel great the next morning than get sloppy and end up paying for it. I'm also getting old which may factor into that decision process.