Guys, I feel happy for all the help you have provided. I had a discussion with my friend who owns a Car Acc store close to my place. He asked me for an approx figure I was willing to shell out. I was like around 40K. He told me without changing the HU, he would organise Rockford Fosgate Prime Components (All 4 of em), 4 Way Amplifier - 600W, Dampening Kit on all 4 doors. It'll work out fine and he said this will not void any warranty as he is not going to cut any wires.