I was flying a 30% plane and found some were flying larger. Most were flying the same size. If you desire to fly a smaller plane, keep in mind, that it will not present as well as a larger plane. You will have to fly closer to the judges.
Your first season should be more of getting used to the routine and observing the contest. Not flying. Get out there and meet some people, have a good time and most importantly do NOT become dissapointed in your flying. It is meant to be fun.
Last year was my first competetion in Basic. I liked it so much that I entered a contest down in Chicago just to get a fix. Had a very good time and met some really great people that I now look forward to the next time I see them.
Adam