Don't buy Beats at $300... they cost only $230 on Amazon and $175 on Ebay... At those prices, they compete with the M50 IMO If not in sound, then in features.
If priority is sound specifically, you can get other previous recommendations such as the Sennheiser HD 25. I would personally get the Audio Technica ES10 or other IEMs though
Even the Monster Turbine Pros are on a much higher level of fidelity in terms of sound quality