I just bought Sennheier's HD-280 Pro headphones and went to try them on my A7N8X Deluxe with soundstorm. They sounded ok. I then went and tried them on my Onkyo 600 reciever and they sound alot a better. So my question is would I notice any difference if I were to upgrade to the Audigy 2? If so, which version would be best? I mostly use headphones for my computer, but also have 4.1 speakers for it.