Mediclaim…Which is the Best??

My name is Dipesh and i am presently 30 years old.
I have taken insurance from TATA AIG for a priod of 15 years ( 20000 premium / year). The sum assured is 150000 but it is an equity based investment thing too. I want to now invest in an mediclaim scheme which would cover the hospital expenses without affecting my pocket. i have had a visit from bajaj allianz guy who has told me about the health guard policy. is it good? I also would like to know of a scheme wherein i can get my parents also in mediclaim. My father has just retired (58 years) and my mother is 52 years old.
Thank you in advance for your advise.