What Would Be A Good Beginner Sailboat?

I've been sailing for about 4 years now (I'm 15). My family owns a Catalina 22, and I've sailed that solo a few times. I've also taken summer sailing cles for 3 years. My dad is thinking about getting a smaller sailboat along with the one we already have. We would want one that I can sail solo. What are some good, fast, easy-to-rig sailboats?