I've read a ton of threads asking for advice on a headphone or a setup and the recommendations, while good, can be a little random. So how about a specific set of criteria which I think would satisfy the majority of requests. Please be specific with your recommendations. The idea here is instead of sorting through reviews of tons of different products, develop an idea of tried and true combos that people can go to as their first step into the audiophile world.
1) must run off an MP3 player source (ipod, clip, etc)
2) budget $500
3) include headphone and amp
4) prefer good all-round setups, but if it works really well for one genre, say which one