I need a new muffler but now a Flowmaster?

I have a 03 GMC 4.8 and looking for something to replace my Flowmaster 40 thats on it now. I'm looking for something that still has a deep sound but not as muddy or muffled sounding as the 40 series. More importantly, dont have that dead hummmmmmmmmmmmm at cruising speeds. I cant stand that about the Flowmasters. Any Ideas?|||If your not satisfied with flowmaster just try magnaflow. Just research first on you tube for the sound.