Guys last summer I had bought the Maharaja Whiteline Rambo Desert Air Cooler from Vijay Sales in Prabhadevi opposite to Siddhivinayak temple.
They have a wide range of home appliances. Their sales persons showed me a lot of air coolers and I personally found this one the best of all. It has got great features and also consumes less electricity.
It produces very less sound. It is ideal for a medium sized living room and gives nice cool breeze. Its performance for past 1 year has been quite satisfactory.