Good extension, has treble, wide stage, not overly bassy - now we have something to go by! Around $30 - that's a tough call though. For example the GR99 are a tad bit dark, and does put more emphasis on the bass then I'd suspect you'd want. The M1 might do, but I'd be worried about the extension, as I don't remember it extending quite well, though it's been a year since I had them, do take with a grain of salt.
Extension can be a weak spot around this price range, especially if you want the bass to be not overly emphasized. I know people have said good things about the LG Quadbeats on this front - I've not heard them. You might want to ask around on the respective threads for that. Otherwise nothing else comes to mind from personal experience, apologies.