The Kawasaki Ninja 500 - while priced very high for what it is - is a sweet, capable and in true Japanese fashion. It is a machine that is likely to be reliable and last you for years without giving significant issues, provided you maintain it correctly. 

You could also take a look at the Yamaha R3, although most dealers we have spoken to in major metro cities have informed us that they don't have any stock, nor are they expecting a new shipment anytime soon. 

Its best to speak to your nearest authorised Yamaha dealer and see what the situation in your area is like. The R3 is a rather simple machine with no frilly features. But it packs a potent engine and chassis, and it has also cemented its reputation for reliability in our market. 

The Kawasaki Z650 and Ninja 650 are the only reliable big bike options below the 10 lakh rupee mark from a reputed make. Also, you'll have to considerably extend your budget for anything else. Should you be able to do so, bikes like the Suzuki GSX-8R and Honda CB750 Hornet will be the next stepping stones. 

Try to take a test ride of these machines to see which one suits you best before you make a decision.