If you want big, closed-type under US$200 headphones, I'd recommend these over Beats:
Sennheiser HD 280 Pro - under US$100 - sound is an acquired taste and can be tight on ones head, but great isolation and high sensitivity.
Sony MDR-7506 - under US$100 - bright with more than ample bass, just like pop music.
Audio-Technica ATH-M50x - about US$170 - gentle and refined, but less isolation than others here.
Sennheiser HD 380 PRO - under US$200 - sounds smoother and not as vise-like as the 280, but the same great isolation and high sensitivity.
Beyerdynamic DT 770 Pro - under US$200 - haven't tried this myself, but have heard great things about it.
Another thing is that all these models have been around for a while, and disposables like ear pads and cables are readily available.