If you are still in the market for Studio Monitors... I can tell you flat out that the Yamaha HS80Ms are the best monitors I have ever listened to and had the pleasure of purchasing. Their frequency response is definitely the best I have heard, with pristine highs, warm mids, and flat response sub all the way down the spectrum. To be honest, I bought the HS10W subwoofer to go with them and quickly realized that I did not need it at all.
I have worked with Mackie HR624s and KrK rokits, and these are absolutely my favorite.
Good luck, I hope that helps!