I have some ideas but recomindations are fine with me
Ath m50s
Crossfade lp2s
Hd 25-II
The HD25-1 ii would be my suggestion. Comfortable/light-weight, great sound, portable, and rugged. I listen to mine everyday and enjoy every second. Especially if you will be using them on and off a bus, I'd think you'd want something durable and light, and the Senns take the cake.
v-80?

Heya,
Ultrasone PRO 750 (black & grey version, not the blue)
Very best,
They have those on Amazon now for $230. Pretty crazy considering their list price was $430. That's a pretty big price decrease.
$206 shipped. Black & Grey version.
I've seen the PRO2500's for $140 in the for sale forum too, but they're open.
Very best,
whats wrong with the blue version?
Do recommend to look at Fischer Audio headphones/cans
Fa004 V2 is fabulous for its price vs performance ratio.