Hi just looking for a bit of advice about sound bars at the moment I have a Sony 40" W5500 which has 10+10w speakers I am considering getting a sound bar, the one I'm looking at is the Sharp hdsl50 which I can pick up for 109 pounds, which is a 2.1 system 25w+25w and 50 w sub woofer, are sound bars any good would I notice a huge difference through the Sarp system over the tv speakers