Hi, I purchased a Logitech Z-5500 in 2008 and was pretty happy with it up until recently. Lately the control pod will produce a constant buzzing noise when sound is not going through it and if I hook it up via optical connection I will get a really loud buzzing noise when i'm not playing sound through it. I have ruled out my sound card and cables being the problem and believe I need a new control pod. Instead of paying about $140 for a new one on ebay I was looking for a new system that would give me better mid-range and highs than my current system. This is what I was currently looking at http/www.bestbuy.com/site/onkyo-5-1-channel-home-theater-speaker-system-with-subwoofer-and-receiver/4964493.p?id=1218587134731&skuId=4964493. Would this system be an upgrade or would I be better off just buying a new control pod or possibly building my own 5.1 system?