I think there no card which would give you 180 days credit . Maximum credit without any penalty is 60 days . You can have any credit card from any bank of repute having arrangement with either VISA or MASTER CARD.
I don't thinks any bank will provide you six months payment period in the current financial situation. I suggest you HDFC Value Plus card as most of my friends review it as the best. They don't charge you much taxes and you get cash back from most of the shopping's.
I personally use the same it's easy to manage.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.