Beat by Dr. Dre Solo sound incredibly small and flat, they lack clarity and detail and should be priced at somewhere around 50 bucks or less.
For around 200 bucks these are the best sounding headsets you are ever going to find:
Sennheiser HD25-1 II
They might not look very stylish but they beat almost anything when it comes to the quality of the sound they produce.
If build quality, comfort, isolation and stylish looks are your concern and you are willing to spend a bit more get the:
Bowers & Wilkins P5
The build quality is second to none on these, super soft New-Sealand sheepskin leather covers almost everything and aluminum protects the rests, these are also very light but feel extremely solid and well built. Sound quality is a bit worse then the HD25 but it has very natural unoffensive and warm sound that especially comes to it's own when listening to classical music.