In order to avoid any back pain in the future i want to get my posture right while iam sitting.
Please reccoment me a good chair which will not affect my back in any way.
Price is around 0-6K
It's one of those things you can't recommend in India. Go to a store, sit on a few chairs and see what suits you best.
If you are in Mumbai or Pune do check out chairwale.com (site is down now for some reason)