Just because you're no audiophile does NOT mean you have to settle for crappy headphones. It costs 2 cents to make a pair of Tours; a pair of JVC Marshmallows will kill them.
Buy the Klipsch Image S4i. Contrary to what you said, they don't have poor build quality. If you ARE worried about build, buy the Etymotic HF5s. Clean, tightly controlled bass and great highs. And you get absolute noise isolation.
Buy the foam eartips. The headphones cost around $40 to actually make without R&D, and Ety sells them for $96. High margins, but at least you're getting way more than those awful wife-Beats.