am in the market for a new set of speakers. 5.1 or 7.1, dont really matter much as long as they kick the hell outta my walls lol. am looking at the Logitech Z680 5.1 Speaker System ( 450 or 505watts, i read that they came out with a better version of it or something so am not sure of the total power) OR the CREATIVE GigaWorks S750 7.1 Speaker (which is 700watts, but i heard the sound isnt as good as a person think). which one is better buy overall: sound, lenght of life, look, power, etc.