I've always thought one of the sticks are the best for a second plane. Particularly the Ultra Stick series. Very easy to fly and very aerobatic. I went with the 60 size as my second plane. But any of them will work well. I've had the 46, the 60 and still own the 120 size. They are a fun plane to fly and very easy to control and will be very aerobatic when you are ready for that.
thanks
barry