Senn 595s are great also, but they really should be amped in order to get their full potential. They're open, which usually means better quality for the money, but they don't block out sound. If you live in a quiet area, this isn't a problem. The main issue is their need of a headphone amplifier. If you are interested in this, by all means we can fill you in.
The A500 ($100) or A900 ($200) hardly benefit at all from amping, since they practically reach full potential right out of things as shoddy as onboard audio or low-quality soundcards. Since 595s cost almost as much as A900's, I'd say go for the Audio-Technicas. Plus, they're closed/sealed, so they'll keep sound from getting out as well as coming in.
003, I didn't know you were a Head-Fier!
Now I see where your headphone wisdom comes from ..