Giving guidance on electronics is easy compared to speakers. You asked a clear question in the title of your thread - should I get an integrated amp or a power amp to be added to my HT system. You have gotten good guidance but have now sidetracked into asking about speakers.
And while I agree that speakers should be chosen first and then an amp that will properly drive those speakers, you will find asking for recommendations for speakers are often meaningless. We don't know what kind of sound you like or even what brands are available in India. So suggest you go out and audition a few, tell us what you heard and then we can go back to the electronics discussion and let you know if the integrated or power amps you are considering are up to the task.