I am planning to upgrade my new Ford Figo ICE. I prefer Polk Audio Components for the front, Polk Audio Oval Speakers for the rear, Polk SUB or JBL SUB with enclosure. I am ready to spend Rs. 35,000/- for Polk Audio Components for the front, Polk Audio Oval Speakers for the rear, Polk SUB or JBL SUB with enclosure. But I need suggestion for the amplifiers. How many amplifiers will do? Which amplifier is the best? The head unit I am gonna buy is Sony XAV 601BT. Kindly help.