I'm going to have to answer with a flat out NO. You should not get a biplane as as second plane. And the biggest reason why I say not to is mainly the landing. Almost 99% of people who learn to fly a trainer are taught to land their trainer by cutting the throttle and letting the plane float in for a landing. There is nothing wrong with that as it's really a good way to teach a new person to fly. I do with my students as well. But if you try that approach with a biplane you are more than likely going to wind up with a pile of broken plane parts after the plane stalls from 10' up. A biplane really needs to be flown completely down to the ground. Once you have some experience in flying with other planes this isn't hard to do at all, but it is something that you need to learn how to do first. Move to a Tiger II or a 4-star first to learn these skills. And then move on to the biplane. When you do get ready for a biplane I recommend the Sig Hog Bipe. It's probably the most well mannered of most of the biplanes out there these days as it really has not bad habits that other biplanes can have.

Ken