1. Pawan Kalyan
2. Ram Charan
3. Allu Arjun
4. Mahesh Babu (He's still big, just because of 2 back to back disasters I'm ranking him 4.)
6. Ravi Teja
7. NTR Jr. (Again back to back big flops has pushed him down.)
And them comes Nithiin, Gopichand, Naga Chaitanya, Ram, Vishnu Manchu, Manoj Manchu... as they're not consistent. Nithiin is consistent in giving successful films but he hasn't turned them into bigger hits.
Rana Daggubati isn't accepted the way he was supposed to yet. After Baahubali, his future in Telugu industry will get better clarity.
I am keeping Siddharth separate as he has a loyal fan following among girls but currently he has gone down.
Allari Naresh is basically a minimum guarantee hero & is more like Govinda (not in talent), he basically acts in comedy films which are safe ventures & only rarely we get to see him in meaty roles exploring his acting skills. Good actor but does way too many comedy films as he can only survive in them as a lead hero.