Oh the Sony SA5000, it puts the Senn HD800 to shame but it's a Sony and that's not cool.
One of my favorite headphones, owned the SA3k and spent some time with the SA5k, may also treat myself come Christmas.
I listen to all genres, save for heavy metal, rap, that sort of thing. I predominantly listen to electronica, some folk and classical. I enjoy the speed and resolution of the Sony SAs, I prefer the SA5k with electronica for the additional bass, and the SA3k with folk and classical for it's more open and airy presentation.
At time of owning the phones I had a solid-state Corda Meier Headfive which is considered a good, neutral amp. I also owned a SinglePower PPX3 SLAM tube amp which paired much better with the SAs, the additional body warmed the phones up a great deal, turning them from a thin, cold phone into something very close to neutral. I wouldn't consider a Sony SA without a warm amp. Likewise a warmer, perhaps more analogue sounding source would be better than a brighter, metallic DAC such as the Benchmark DAC1 or W4S DAC. A good source is paramount for the aggressively detailed SAs.