Sennheiser Recommendations?

I wish to purchase a new pair of headphones. Sennheiser has been decided on as the manufacturer. There is some decent equipment in the equation, notably: an Audio Alchemy DTI v2.0, a Parasound DAC-1600 and a Melos Sha-Gold. My listening tastes are pop and rock. The models for consideration are: 555, 580 and 595. Money, though not determining, is also a factor.