The pulse would probably be your best choice. I also see alot of guys recommend the 4 star as a great 2nd plane. I have flown neither of them but there are several of the 4 stars at our club and they really fly nice. My 2nd plane was a twist 40. It was pretty inexpensive when I bought it and it would land really slow. Even slower than most of the trainers I have seen and flown. I just used low rates to fly it until I got comfortable enough to really put it to task. I dont know if your into warbirds or not, but the pts mustang would be a nice little low wing to try. You can leave some of the training aids on it until you feel confident enough to advance to the sport settings. It is a really fun plane to fly.
Depending on your skills and progress, you could learn to fly the extra, but would probably be a good idea to buddy box for a bit until you got the feel for it. Its a pretty responsive plane.
I know you have planes in mention, but there are some that would probably be a bit better as a 2nd and im sure others will chime in on ideas not on your list as well. The ideas are only offered to help you progress and enjoy the hobby.
Good luck on your 2nd plane choice.