You can take everything I say with a grain of salt because I quite like the Senn HD600 sound.
Until recently I had dt990s (05), which had nice punchy bass, more than any Grado I've tried (325i and below), but compared to the Grados and Sennheiser HD6xx the DT990s were a bit too recessed in the mids and a bit too strong in the highs/sibilant for my taste. At high volume they were fatiguing and a low volume they sounded really thin and tinny.
That said, I have no idea what you should try, because I've pretty much only heard Beyers, Senns, and Grados.