My tastes are very similar to yours and you will not regret the HD600, trust me on this. Very well rounded, excellent timbre. I am unsure about your amp but if it can power it then it'll be fine. There's not a lot of difference between low-mid end amps anyway.
If you're not prepared to shell a grand on an HD800, an HD600 is your best bet for a headphone.
ps. I'm already out of the headphone hobby - the HD600 happens to kick me out.