Visit India Fares
Utilise the visit india fares on jet airways. The total cost of the ticket will be us$ 600 + 10$ per flight coupon. However it gives you unlimited travel all over india for a 2 week period.
Even the 1 week option is good and there are very helpful people at the jet airways airport counter who will do it for you.
Recently was in india - fare at that time was us 500 and covered 9 cities in 7 days at about 40% of what it would have cost me otherwise.