How much do you want to spend? For about $20 at Circuit City, the Koss Sporta Pro's are excellent. I'm not a fan of Koss at all, but when I heard these.. They are fantastic for the money and CC has a great return policy on these if you happen not to like them.
The Porta Pro's are really nice as well at $50, but the Sporta's are a better value. The difference is that the midrange is a bit more open and the bass is a little more controlled. There is a Radio Shack mod that you can do to both sets of cans if you are interested in less bass. The Rat Shack pads are more open (not as thick) and lean out the bass and open up the mids and highs a bit. If you want info on this, PM me and I'll get you the information on which pads from Rat Shack.
I have the Sporta's and couple pairs of Grado's. I personally like the Grado's, but they may not be for you and I don't know what your budget is. They start at $69 retail for the SR60's.
Sal