Get the ATP!
Like many, I've tried to get the free ATP via CA upgrade. Gone in smoke. Don't try to save the $$$ now, or it may cost your career. You have come this far, don't risk not getting hired.
I have paid for mine, so far no benefit, but no regrets at all, waiting to hear from EJA.
I would suggest against All ATP's. I could have gotten my ATP much cheaper. I was the guys second student ever. He got lost in the training area and even worse.
Good luck.