The HD-555 are nice headphones. You're gonna like them.
My headphone inventory: Sennheiser HD-600: for classical, jazz, vocal, and rock Denon AH-D2000: for rock and dynamic music, not for classical Grado SR60: for travel and sometimes portable Sennheiser PX 100: for portable
JVC in ear: for portable when in noisy environments
Apple ear buds: as an example of how bad ear buds can sound