Quote:
Originally Posted by goodguy8705 
Right now I think I may go with the HD555's but I'm unsure if they outperform the HD4XX cans and a small amp.
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The HD555s aren't in the same league as the 600 series. I have not heard the 595s, but I would not recommend the 555s if you primarily listen to music; IMHO they are primarily for cinema and gaming use.
I have owned the HD600/650s as well as and they are much better in every way than the 555s; they were my first "real" cans after my Koss Pro 4As. As far as the other Senns go, I have heard good things about the 595s, the HD25-1IIs, and the HD-280s.
The Shure SRH750/840, Grado SR225i, the Roland RH-200/300, and the German Maestros are worth checking out also, so good luck!
edit: whoops, you asked about the HD4XX phones (not the HD6XX), sorry never heard those
