Those Dre headphones are highly overrated. If you are an audio engineer, stay away from them. If you are just a casual listener, go for whatever sounds best to you.
Bose are for audiophiles who listen to different genres of music. The Dre headphones are mainly for people who listen to mostly rap. They are good for that genre but you start hearing the flaws in the headphones in the upper midrange. Bottom-heavy music sounds good but ANYTHING ELSE sounds like bass is being forced into the music. If you listen to jazz, classical or rock, forget these.
Sonys are solid as fuck and give the best flat response on the market. There is a reason everybody used the 7506s.
Sennheizers are some of my favorite headphones to listen to music in. That said, like the Dre headphones, they lie to you. I like the bass enhancement of the Sennheizers better than the Dre headphones. A LOT better. Its smoother and less forced.
The Audio Technica ATH-A700 cans are off the hook but be ready to come out of pocket for them.
Ironically, the good Dre headphones are the earbuds. So far, they are the only decent earbuds I've heard. I generally hate earbuds with a passion.