Do not buy N7900, that at 17ks. I think there are better one's than yamaha, even N8900, which is better than at N7900, is not that good. However, the price quoted is 17k, but I was getting N8900 at around 12ks from a Yamaha dealer.
Why don't you think about the mission Towers on clearance sale from Savoy India. (They are the official distributors of Yamaha and Mission).
Just go through the thread posted by Yogesh, "Yamaha and Mission:Clearance sale". I hope all of your queries will be answered. They have RXV-465 on sale that too on discounted price.
Today I was at Vijay Sales, Inorbit Malad. They quoted NS-7900 + NSP-7900 combo (i.e., 5 speakers) for Rs.20K. It was the only set available with them. I did not enquire further on that. If bargained may get for still lesser price.