I use z-560s on my laptop for music and ocassional movies. Is my integrated soundcard suficient for these purposes? What kind of sound quality am I missing out on? I ordered a USB Audigy 2 but its back ordered so I'm going to cancel it...if I do get an external card what is better the Audigy 2 ot Extigy...both are same price (refurb extigy on ebay)?