...one thing I really liked about the 650's was how good the instruments sounded but I felt like the singer was being overshadowed.
I am looking for a sound signature that emphasizes the voice of the singer and makes it sound forward and detailed. l I believe this is called the treble region don't quote me on that as I don't know the full difference between the treble and upper mids. Other things that are important to me are instrument separation and sound stage and the instruments themselves I really like the way they sounded on the hd-650.
Budget wise I can go up to 500 but its slightly flexible, and it doesn't matter to me if its and open or closed can.I want them to sound fun and not overly analytical as I am not looking for a neutral sound. I listen to alot of different genres of rock, Sinatra, and guitar heavy songs. Basically the only recommendation I have gotten is grado so should I just stick with those?
Fundamental frequencies for voice are ~100-900 Hz for male voice & ~300 - 1500 Hz for female voice, which I'd call mids and maybe lower treble. For that range HE-500 are hard to beat. HD600 are also pretty special, really remedying the overshadowed singer you describe with the HD650, which sound more v-shaped to me with the dip where voices should go.. Don't get a closed can, none can do voice as well as an open can. In your shoes I'd spring for HE500, they're a big jump in quality relative to HD600/650 & any SR Grado.