sennihiser px200's are great.
I use mine mainly at home, i use the in ear type at the gym.
http://www.amazon.com/Sennheiser-PX2.../dp/B000089GN4
These are the best headphones under $100.00 and many audiophile web sites give these their top inexpensive pick.
Although they are a bit on the fugly side.
http://www.amazon.com/Koss-PortaPro-...GA9PEQA0T9DZFY
Here's another that gets rave reviews. I bought them after reading loads of people gush about the sound quality. Not to mention the cheapie price.
http://www.amazon.com/Koss-KSC75-Por...ref=pd_sim_e_2
And last but not least, another top performer that goes for sound quality over looks.
http://www.amazon.com/Grado-Prestige...ef=pd_sim_e_18