Hello All, I just upgraded my Northridge 5.1 setup by replacing the front mains (N28) with Studio Series 310 II floorstanders. They are sweet! However, I am now looking to replace the center channel with a Studio Series model. What is the difference between the series I and II center (besides the color)? It seems the series I is more availible used, but I want whatever is better/matches the mains. Thanks.