The title "super star" is the dream or we can say a "passion" for many actors. Some may hide it, some may express it explicitly.

Some people will say that there is “one and only” Super star and he is "Rajinikanth"...  But we have to accept that in Kollywood after MGR came our super star Rajini... And He was the man who occupied the "prestigious" throne SUPERSTAR!!
Now we need successors to occupy that place!!

Here I have some "famous" names for the contenders

Ilayathalapathy Vijay.
Ultimate star Ajith.
Charming Suriya.

Ilayathalapathy Vijay:
He is rightly called as "man of masses", the king of collections and so on. We will discuss what this man is having in his pocket to become a “Super star”. Well, my first my answer is he is having "the same kind of hardcore ardent fans" just like the mighty Rajini. Almost 50000 fans club across Tamil Nadu. His charming screen presence attracts many, but many of us criticize him for his stereotypical story selection. I guess he changed a lot and this man is now at his best in choosing directors. His future projects are with Shankar, A.R. Murugadoss, Gautam Menon and A.L.Vijay!!

If he is careful in story selection, he is going to give a "tough" fight for the rest of the two.

Ultimate star Ajith:

When Vijay is called as King of collections, this man can be rightly called as "King of openings". He is having equal number of fans and even one can say he has "Loyal" fans just like Rajinikanth. And movies like “Varalaaru”, “Villain”, “Vaali” and now “Mankatha” proves that he has good acting skills and also he is NOT stereotypical like Vijay, but his choice of directors in most of his movies pulled him down a bit.
Now he is choosing his scripts very carefully. If this is going to continue then there will be many "mangaatha daa" in future.

Charming Suriya:

I can boldly say him as "Aamir Khan" of Tamil Nadu. This man Suriya, invests nothing but hard work and some intelligence in choosing scripts which lead him to be the top competitor for Vijay and Ajith who have completed 50 films. But still he is not having the so called "ardent" fans!! So that’s the problem for him to become a superstar otherwise he will end his career “like” Kamal Hasan who has fans from all region but the most important term "ardent" is missing. Everyone likes Kamal but not many of us would say that he is a "Super Star".