I have a pair of Bose TriPorts. I like them a lot. They have good bass and mid frequency response I find, which is good because my Zune doesn't have EQ to boost those up when lacking. They're wicked comfy, and they block out noise really well. I got my pair for free, so I'm not sure if it's worth $150 to me, but they are nice phones. Hell I'm still sad that there's not enough room in my house for my dad to set up his mid-80s set of Series IV 901 speakers. Those things sound killer!
EDIT: And just so people don't call me a fanboy, there are Bose products I don't like. Their earbuds suck. My friend (with way too much money) claims that he's got the perfect setup with an iPod Touch, Bose buds, and a Bose Soundock. I just laugh about how for all the money he paid, I got my Zune, my Ety ER-6 buds, and a 200W stereo receiver with pretty decent parts. My setup probably cost $400 bucks less than his.