welcome to head-fi!
hmmm, at ~$150 you've got quite a lot of options available
first a few questions, what kind of music do you listen to? what do you use to listen to music? (CD player, portable device, computer, integrated amplifier, etc, and tell us which model of device you're using (for example: I use a computer with an X-Fi Prelude or a Yamaha CDV-W901))
do you need any isolation? (i.e: are the headphones going to be competing with external noises (people talking, animals, children, lots of noise in general, etc))
just to throw some things out there for you to go listen to, regardless of what you answer above (we'll narrow the list when you answer the above):
Sennheiser HD-555
Sennheiser HD-280Pro
Grado SR-125
Grado SR-60/80 (the 125 will do everything either of these can do, just "better", and all three fit your budget, so thats why I'm kind of weary to suggest these two)
JVC HA-RX700
JVC HA-RX900
M-Audio Studiophile Q40
Denon AH-D1000
Denon AH-D1001
now, you should go and listen to as many of these as you can, or any other options you find in the budget (yes, if that means you go and listen to Bose TriPorts (yes people in these parts really dislike bose) and end up loving them over anything else I've listed, that they win, however don't make them the only thing you listen to (at least get 2 or 3 pairs auditioned so you can make a decent decision))
of the above, I would probably move the SR-125, Q40, and HD-280Pro to the top of my list, in your price range, however thats because they tend to suit me quite nicely (realize, thats my personal taste, not an absolute fact)