First 90 CP, who should I buy?

Hi everyone. Been playing for a few months now (Level 27), and new on the forum.. and I have finally reached saving up for 90 CP for the first time. It would have been sooner had I not bought Human Torch, Lady Sif and Colossus along the way.

A question to all of you experienced gamers who are willing to share their knowledge and expertise... Who should I buy? Which Hero or Heroine can help me the most in my initial stages of playing? So many 90 CPS, but I am very cautious to make the wrong decision.

Here is my line up so far:
Black Cat, Ms. Marvel, Lady Sif, Iron Man, Black Widow, Hawkeye, Colossus, Human Torch


Any help would be greatly appreciated. Thank you in advance.