RE: Best choice for second plane
Depends. If you have an instructor who will introduce you to it on a buddy cord, it doesn't matter what your experience level is, the instructor will get you used to it before soloing you.
Most students want to fly their second and subsequent planes without a cord, and that makes the planes like 4-stars and the Goldberg Tiger a better choice. There are others.
If you want to do it all yourself, choose a more forgiving plane than the colt. If you have an instructor who will spend the time with you, pick anything.
Good luck,
Dave Olson